Update dependencies.

Gemfile

@@ -1,7 +1,7 @@
 source 'https://rubygems.org'
 
 group :development, :test do
-  gem 'jekyll', '~> 3.4.0'
+  gem 'jekyll', '~> 3.4.2'
   gem 'jekyll-redirect-from', '~> 0.12.1'
   gem 'jekyll-sitemap', '~> 1.0.0'
   gem 'scss_lint', '~> 0.52.0'

Gemfile.lock

@@ -4,9 +4,9 @@ GEM
     addressable (2.5.0)
       public_suffix (~> 2.0, >= 2.0.2)
     colorator (1.1.0)
-    ffi (1.9.17)
+    ffi (1.9.18)
     forwardable-extended (2.6.0)
-    jekyll (3.4.0)
+    jekyll (3.4.2)
       addressable (~> 2.4)
       colorator (~> 1.0)
       jekyll-sass-converter (~> 1.0)
@@ -49,10 +49,10 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  jekyll (~> 3.4.0)
+  jekyll (~> 3.4.2)
   jekyll-redirect-from (~> 0.12.1)
   jekyll-sitemap (~> 1.0.0)
   scss_lint (~> 0.52.0)
 
 BUNDLED WITH
-   1.13.6
+   1.14.6

grunt/postcss.config.js

@@ -0,0 +1,41 @@
+module.exports = (ctx) => ({
+  map: ctx.file.dirname.startsWith('docs') ? false : {
+    inline: false,
+    annotation: true,
+    sourcesContent: true
+  },
+  plugins: {
+    autoprefixer: {
+      browsers: [
+        //
+        // Official browser support policy:
+        // https://v4-alpha.getbootstrap.com/getting-started/browsers-devices/#supported-browsers
+        //
+        'Chrome >= 35', // Exact version number here is kinda arbitrary
+        // Rather than using Autoprefixer's native "Firefox ESR" version specifier string,
+        // we deliberately hardcode the number. This is to avoid unwittingly severely breaking the previous ESR in the event that:
+        // (a) we happen to ship a new Bootstrap release soon after the release of a new ESR,
+        //     such that folks haven't yet had a reasonable amount of time to upgrade; and
+        // (b) the new ESR has unprefixed CSS properties/values whose absence would severely break webpages
+        //     (e.g. `box-sizing`, as opposed to `background: linear-gradient(...)`).
+        //     Since they've been unprefixed, Autoprefixer will stop prefixing them,
+        //     thus causing them to not work in the previous ESR (where the prefixes were required).
+        'Firefox >= 38', // Current Firefox Extended Support Release (ESR); https://www.mozilla.org/en-US/firefox/organizations/faq/
+        // Note: Edge versions in Autoprefixer & Can I Use refer to the EdgeHTML rendering engine version,
+        // NOT the Edge app version shown in Edge's "About" screen.
+        // For example, at the time of writing, Edge 20 on an up-to-date system uses EdgeHTML 12.
+        // See also https://github.com/Fyrd/caniuse/issues/1928
+        'Edge >= 12',
+        'Explorer >= 10',
+        // Out of leniency, we prefix these 1 version further back than the official policy.
+        'iOS >= 8',
+        'Safari >= 8',
+        // The following remain NOT officially supported, but we're lenient and include their prefixes to avoid severely breaking in them.
+        'Android 2.3',
+        'Android >= 4',
+        'Opera >= 12'
+      ]
+    },
+    'postcss-flexbugs-fixes': {}
+  }
+})

grunt/postcss.js

@@ -1,42 +0,0 @@
-module.exports = {
-  use: [
-    'postcss-flexbugs-fixes',
-    'autoprefixer'
-  ],
-  map: {
-    inline: false,
-    annotation: true,
-    sourcesContent: true
-  },
-  autoprefixer: {
-    browsers: [
-      //
-      // Official browser support policy:
-      // https://v4-alpha.getbootstrap.com/getting-started/browsers-devices/#supported-browsers
-      //
-      'Chrome >= 35', // Exact version number here is kinda arbitrary
-      // Rather than using Autoprefixer's native "Firefox ESR" version specifier string,
-      // we deliberately hardcode the number. This is to avoid unwittingly severely breaking the previous ESR in the event that:
-      // (a) we happen to ship a new Bootstrap release soon after the release of a new ESR,
-      //     such that folks haven't yet had a reasonable amount of time to upgrade; and
-      // (b) the new ESR has unprefixed CSS properties/values whose absence would severely break webpages
-      //     (e.g. `box-sizing`, as opposed to `background: linear-gradient(...)`).
-      //     Since they've been unprefixed, Autoprefixer will stop prefixing them,
-      //     thus causing them to not work in the previous ESR (where the prefixes were required).
-      'Firefox >= 38', // Current Firefox Extended Support Release (ESR); https://www.mozilla.org/en-US/firefox/organizations/faq/
-      // Note: Edge versions in Autoprefixer & Can I Use refer to the EdgeHTML rendering engine version,
-      // NOT the Edge app version shown in Edge's "About" screen.
-      // For example, at the time of writing, Edge 20 on an up-to-date system uses EdgeHTML 12.
-      // See also https://github.com/Fyrd/caniuse/issues/1928
-      'Edge >= 12',
-      'Explorer >= 10',
-      // Out of leniency, we prefix these 1 version further back than the official policy.
-      'iOS >= 8',
-      'Safari >= 8',
-      // The following remain NOT officially supported, but we're lenient and include their prefixes to avoid severely breaking in them.
-      'Android 2.3',
-      'Android >= 4',
-      'Opera >= 12'
-    ]
-  }
-}

package.json

@@ -25,8 +25,8 @@
     "htmllint": "htmllint --rc docs/.htmllintrc _gh_pages/**/*.html js/tests/visual/*.html",
     "jekyll": "bundle exec jekyll build",
     "jekyll-github": "shx echo 'github: true' > $npm_config_tmp/twbsjekyll.yml && npm run jekyll -- --config _config.yml,$npm_config_tmp/twbsjekyll.yml && shx rm $npm_config_tmp/twbsjekyll.yml",
-    "postcss": "postcss --config grunt/postcss.js --replace dist/css/*.css",
+    "postcss": "postcss --config grunt/ --replace dist/css/*.css",
-    "postcss-docs": "postcss --config grunt/postcss.js --no-map --replace docs/assets/css/docs.min.css && postcss --config grunt/postcss.js --no-map --replace docs/examples/**/*.css",
+    "postcss-docs": "postcss --config grunt/ --replace docs/assets/css/docs.min.css && postcss --config grunt/ --replace docs/examples/**/*.css",
     "sass": "node-sass --output-style expanded --source-map true --precision 6 scss/bootstrap.scss dist/css/bootstrap.css && node-sass --output-style expanded --source-map true --precision 6 scss/bootstrap-grid.scss dist/css/bootstrap-grid.css && node-sass --output-style expanded --source-map true --precision 6 scss/bootstrap-reboot.scss dist/css/bootstrap-reboot.css",
     "sass-docs": "node-sass --output-style expanded --source-map true --precision 6 docs/assets/scss/docs.scss docs/assets/css/docs.min.css",
     "scss-lint": "bundle exec scss-lint --config scss/.scss-lint.yml scss/*.scss",
@@ -52,12 +52,12 @@
     "tether": "^1.4.0"
   },
   "devDependencies": {
-    "autoprefixer": "^6.7.2",
+    "autoprefixer": "^6.7.7",
     "babel-eslint": "^7.1.1",
     "babel-plugin-transform-es2015-modules-strip": "^0.1.0",
     "babel-preset-es2015": "^6.22.0",
-    "clean-css-cli": "^4.0.0",
+    "clean-css-cli": "^4.0.8",
-    "eslint": "^3.15.0",
+    "eslint": "^3.17.1",
     "grunt": "^1.0.1",
     "grunt-babel": "^6.0.0",
     "grunt-build-control": "^0.7.1",
@@ -66,9 +66,9 @@
     "grunt-contrib-concat": "^1.0.1",
     "grunt-contrib-connect": "^1.0.2",
     "grunt-contrib-copy": "^1.0.0",
-    "grunt-contrib-qunit": "^1.2.0",
+    "grunt-contrib-qunit": "^1.3.0",
     "grunt-contrib-watch": "^1.0.0",
-    "grunt-exec": "^1.0.1",
+    "grunt-exec": "^2.0.0",
     "grunt-saucelabs": "^9.0.0",
     "grunt-stamp": "^0.3.0",
     "htmlhint": "^0.9.13",
@@ -76,12 +76,12 @@
     "is-travis": "^1.0.0",
     "load-grunt-tasks": "^3.5.2",
     "node-sass": "^4.5.0",
-    "postcss-cli": "^2.6.0",
+    "postcss-cli": "^3.0.0-beta",
     "postcss-flexbugs-fixes": "^2.1.0",
-    "shelljs": "^0.7.6",
+    "shelljs": "^0.7.7",
     "shx": "^0.2.2",
     "time-grunt": "^1.4.0",
-    "uglify-js": "^2.7.5"
+    "uglify-js": "^2.8.12"
   },
   "engines": {
     "node": ">=4"