Add Hugo Piper with SCSS support and much more

Before this commit, you would have to use page bundles to do image processing etc. in Hugo.

This commit adds

* A new `/assets` top-level project or theme dir (configurable via `assetDir`)
* A new template func, `resources.Get` which can be used to "get a resource" that can be further processed.

This means that you can now do this in your templates (or shortcodes):

```bash
{{ $sunset := (resources.Get "images/sunset.jpg").Fill "300x200" }}
```

This also adds a new `extended` build tag that enables powerful SCSS/SASS support with source maps. To compile this from source, you will also need a C compiler installed:

```
HUGO_BUILD_TAGS=extended mage install
```

Note that you can use output of the SCSS processing later in a non-SCSSS-enabled Hugo.

The `SCSS` processor is a _Resource transformation step_ and it can be chained with the many others in a pipeline:

```bash
{{ $css := resources.Get "styles.scss" | resources.ToCSS | resources.PostCSS | resources.Minify | resources.Fingerprint }}
<link rel="stylesheet" href="{{ $styles.RelPermalink }}" integrity="{{ $styles.Data.Digest }}" media="screen">
```

The transformation funcs above have aliases, so it can be shortened to:

```bash
{{ $css := resources.Get "styles.scss" | toCSS | postCSS | minify | fingerprint }}
<link rel="stylesheet" href="{{ $styles.RelPermalink }}" integrity="{{ $styles.Data.Digest }}" media="screen">
```

A quick tip would be to avoid the fingerprinting part, and possibly also the not-superfast `postCSS` when you're doing development, as it allows Hugo to be smarter about the rebuilding.

Documentation will follow, but have a look at the demo repo in https://github.com/bep/hugo-sass-test

New functions to create `Resource` objects:

* `resources.Get` (see above)
* `resources.FromString`: Create a Resource from a string.

New `Resource` transformation funcs:

* `resources.ToCSS`: Compile `SCSS` or `SASS` into `CSS`.
* `resources.PostCSS`: Process your CSS with PostCSS. Config file support (project or theme or passed as an option).
* `resources.Minify`: Currently supports `css`, `js`, `json`, `html`, `svg`, `xml`.
* `resources.Fingerprint`: Creates a fingerprinted version of the given Resource with Subresource Integrity..
* `resources.Concat`: Concatenates a list of Resource objects. Think of this as a poor man's bundler.
* `resources.ExecuteAsTemplate`: Parses and executes the given Resource and data context (e.g. .Site) as a Go template.

Fixes #4381
Fixes #4903
Fixes #4858

magefile.go

@@ -46,17 +46,17 @@ func Vendor() error {
 
 // Build hugo binary
 func Hugo() error {
-	return sh.RunWith(flagEnv(), goexe, "build", "-ldflags", ldflags, packageName)
+	return sh.RunWith(flagEnv(), goexe, "build", "-ldflags", ldflags, "-tags", buildTags(), packageName)
 }
 
 // Build hugo binary with race detector enabled
 func HugoRace() error {
-	return sh.RunWith(flagEnv(), goexe, "build", "-race", "-ldflags", ldflags, packageName)
+	return sh.RunWith(flagEnv(), goexe, "build", "-race", "-ldflags", ldflags, "-tags", buildTags(), packageName)
 }
 
 // Install hugo binary
 func Install() error {
-	return sh.RunWith(flagEnv(), goexe, "install", "-ldflags", ldflags, packageName)
+	return sh.RunWith(flagEnv(), goexe, "install", "-ldflags", ldflags, "-tags", buildTags(), packageName)
 }
 
 func flagEnv() map[string]string {
@@ -111,18 +111,19 @@ func Check() {
 }
 
 // Run tests in 32-bit mode
+// Note that we don't run with the extended tag. Currently not supported in 32 bit.
 func Test386() error {
 	return sh.RunWith(map[string]string{"GOARCH": "386"}, goexe, "test", "./...")
 }
 
 // Run tests
 func Test() error {
-	return sh.Run(goexe, "test", "./...")
+	return sh.Run(goexe, "test", "./...", "-tags", buildTags())
 }
 
 // Run tests with race detector
 func TestRace() error {
-	return sh.Run(goexe, "test", "-race", "./...")
+	return sh.Run(goexe, "test", "-race", "./...", "-tags", buildTags())
 }
 
 // Run gofmt linter
@@ -266,3 +267,13 @@ func CheckVendor() error {
 func isGoLatest() bool {
 	return strings.Contains(runtime.Version(), "1.10")
 }
+
+func buildTags() string {
+	// To build the extended Hugo SCSS/SASS enabled version, build with
+	// HUGO_BUILD_TAGS=extended mage install etc.
+	if envtags := os.Getenv("HUGO_BUILD_TAGS"); envtags != "" {
+		return envtags
+	}
+	return "none"
+
+}