Use NPM versions in builds

This changes the Grunt script to automatically pull the locations of the
NPM versions of the Almond loader and jQuery mousewheel plugin. This
means we no longer need to include these vendor files in our repository,
as the builds will automatically pull from the existing NPM files.

Gruntfile.js

@@ -4,7 +4,7 @@ module.exports = function (grunt) {
     'jquery.select2',
     'almond',
 
-    'jquery.mousewheel' // shimmed for non-full builds
+    'jquery-mousewheel' // shimmed for non-full builds
   ];
 
   fullIncludes = [
@@ -256,9 +256,9 @@ module.exports = function (grunt) {
           include: includes,
           namespace: 'S2',
           paths: {
-            almond: '../../vendor/almond-0.2.9',
-            jquery: 'jquery.shim',
-            'jquery.mousewheel': 'jquery.mousewheel.shim'
+            'almond': require.resolve('almond').slice(0, -3),
+            'jquery': 'jquery.shim',
+            'jquery-mousewheel': 'jquery.mousewheel.shim'
           },
           wrap: {
             startFile: 'src/js/banner.start.js',
@@ -275,9 +275,9 @@ module.exports = function (grunt) {
           include: fullIncludes,
           namespace: 'S2',
           paths: {
-            almond: '../../vendor/almond-0.2.9',
-            jquery: 'jquery.shim',
-            'jquery.mousewheel': '../../vendor/jquery.mousewheel'
+            'almond': require.resolve('almond').slice(0, -3),
+            'jquery': 'jquery.shim',
+            'jquery-mousewheel': require.resolve('jquery-mousewheel').slice(0, -3)
           },
           wrap: {
             startFile: 'src/js/banner.start.js',