tutorials: support arbitrary hosting directory (#1097)

* Include all bundles in artifact

change bundle registry such that all bundles are immediately registered,
but must be specifically enabled.  A default registry class enables bundles
that make sense for demonstration purposes.

Added methods to the registry to allow enabling and disabling of bundles
without having to load additional files.

* support alternate asset/worker paths

Change the gulp glob for assets to copy over a more minimal
set of files-- only css, fonts, and images.  Results in a
smaller distributable archive.

Update stylesheet loader to use a constant for the assets path.

This can be customized at run time via MCT.setAssetPath() to
allow MCT to be hosted in various locations.

Update worker loader to support loading workers from blobs to
support packaging as standalone file.

* Load templates via requirejs

* [gulp] lazy-require where reasonable

Require things right before starting tasks to reduce gulp start up time.

* document setAssetPath

gulpfile.js

@@ -21,36 +21,24 @@
  *****************************************************************************/
 
 /*global require,__dirname*/
+
 var gulp = require('gulp'),
-    requirejsOptimize = require('gulp-requirejs-optimize'),
     sourcemaps = require('gulp-sourcemaps'),
-    rename = require('gulp-rename'),
-    sass = require('gulp-sass'),
-    bourbon = require('node-bourbon'),
-    jshint = require('gulp-jshint'),
-    jscs = require('gulp-jscs'),
-    replace = require('gulp-replace-task'),
-    karma = require('karma'),
     path = require('path'),
     fs = require('fs'),
     git = require('git-rev-sync'),
     moment = require('moment'),
-    merge = require('merge-stream'),
     project = require('./package.json'),
     _ = require('lodash'),
     paths = {
         main: 'main.js',
         dist: 'dist',
-        assets: 'dist/assets',
         scss: ['./platform/**/*.scss', './example/**/*.scss'],
+        assets: [
+            './{example,platform}/**/*.{css,css.map,png,svg,ico,woff,eot,ttf}'
+        ],
         scripts: [ 'main.js', 'platform/**/*.js', 'src/**/*.js' ],
         specs: [ 'platform/**/*Spec.js', 'src/**/*Spec.js' ],
-        static: [
-            'index.html',
-            'platform/**/*',
-            'example/**/*',
-            'bower_components/**/*'
-        ]
     },
     options = {
         requirejsOptimize: {
@@ -68,7 +56,6 @@ var gulp = require('gulp'),
             singleRun: true
         },
         sass: {
-            includePaths: bourbon.includePaths,
             sourceComments: true
         },
         replace: {
@@ -82,6 +69,8 @@ var gulp = require('gulp'),
     };
 
 gulp.task('scripts', function () {
+    var requirejsOptimize = require('gulp-requirejs-optimize');
+    var replace = require('gulp-replace-task');
     return gulp.src(paths.main)
         .pipe(sourcemaps.init())
         .pipe(requirejsOptimize(options.requirejsOptimize))
@@ -91,10 +80,16 @@ gulp.task('scripts', function () {
 });
 
 gulp.task('test', function (done) {
+    var karma = require('karma');
     new karma.Server(options.karma, done).start();
 });
 
 gulp.task('stylesheets', function () {
+    var sass = require('gulp-sass');
+    var rename = require('gulp-rename');
+    var bourbon = require('node-bourbon');
+    options.sass.includePaths = bourbon.includePaths;
+
     return gulp.src(paths.scss, {base: '.'})
         .pipe(sourcemaps.init())
         .pipe(sass(options.sass).on('error', sass.logError))
@@ -108,6 +103,9 @@ gulp.task('stylesheets', function () {
 });
 
 gulp.task('lint', function () {
+    var jshint = require('gulp-jshint');
+    var merge = require('merge-stream');
+
     var nonspecs = paths.specs.map(function (glob) {
             return "!" + glob;
         }),
@@ -122,6 +120,8 @@ gulp.task('lint', function () {
 });
 
 gulp.task('checkstyle', function () {
+    var jscs = require('gulp-jscs');
+
     return gulp.src(paths.scripts)
         .pipe(jscs())
         .pipe(jscs.reporter())
@@ -129,18 +129,20 @@ gulp.task('checkstyle', function () {
 });
 
 gulp.task('fixstyle', function () {
+    var jscs = require('gulp-jscs');
+
     return gulp.src(paths.scripts, { base: '.' })
         .pipe(jscs({ fix: true }))
         .pipe(gulp.dest('.'));
 });
 
-gulp.task('static', ['stylesheets'], function () {
-    return gulp.src(paths.static, { base: '.' })
+gulp.task('assets', ['stylesheets'], function () {
+    return gulp.src(paths.assets)
         .pipe(gulp.dest(paths.dist));
 });
 
 gulp.task('watch', function () {
-    gulp.watch(paths.scss, ['stylesheets']);
+    return gulp.watch(paths.scss, ['stylesheets', 'assets']);
 });
 
 gulp.task('serve', function () {
@@ -148,9 +150,9 @@ gulp.task('serve', function () {
     var app = require('./app.js');
 });
 
-gulp.task('develop', ['serve', 'stylesheets', 'watch']);
+gulp.task('develop', ['serve', 'install', 'watch']);
 
-gulp.task('install', [ 'static', 'scripts' ]);
+gulp.task('install', [ 'assets', 'scripts' ]);
 
 gulp.task('verify', [ 'lint', 'test', 'checkstyle' ]);