Webpack (#1367)

* Replace gulp with webpack and npm scripts for JS compilation
* Set up Travis CI to commit compiled JS
* Restructure `js` directory; only one instance of npm, forum/admin are "submodules"
* Refactor JS initializers into Application subclasses
* Maintain partial compatibility API (importing from absolute paths) for extensions
* Remove minification responsibility from PHP asset compiler
* Restructure `less` directory

js/src/common/utils/patchMithril.js

@@ -0,0 +1,45 @@
+import Component from '../Component';
+
+export default function patchMithril(global) {
+  const mo = global.m;
+
+  const m = function(comp, ...args) {
+    if (comp.prototype && comp.prototype instanceof Component) {
+      let children = args.slice(1);
+      if (children.length === 1 && Array.isArray(children[0])) {
+        children = children[0]
+      }
+
+      return comp.component(args[0], children);
+    }
+
+    const node = mo.apply(this, arguments);
+
+    if (node.attrs.bidi) {
+      m.bidi(node, node.attrs.bidi);
+    }
+
+    if (node.attrs.route) {
+      node.attrs.href = node.attrs.route;
+      node.attrs.config = m.route;
+
+      delete node.attrs.route;
+    }
+
+    return node;
+  };
+
+  Object.keys(mo).forEach(key => m[key] = mo[key]);
+
+  /**
+   * Redraw only if not in the middle of a computation (e.g. a route change).
+   *
+   * @return {void}
+   */
+  m.lazyRedraw = function() {
+    m.startComputation();
+    m.endComputation();
+  };
+
+  global.m = m;
+}