Minified js (#485)

no issue

- Added a `js` task to run on the gulp build process and minifies our js files
- Changed the required scripts in `default.hbs` to use the minified js files in `/built/`
- Moved existing `js` tasks from `zip` task

gulpfile.js

@@ -26,10 +26,12 @@ var nodemonServerInit = function () {
     livereload.listen(1234);
 };
 
-gulp.task('build', ['css'], function (/* cb */) {
+gulp.task('build', ['css', 'js'], function (/* cb */) {
     return nodemonServerInit();
 });
 
+gulp.task('generate', ['css', 'js']);
+
 gulp.task('css', function () {
     var processors = [
         easyimport,
@@ -48,25 +50,34 @@ gulp.task('css', function () {
         .pipe(livereload());
 });
 
+gulp.task('js', function () {
+    var jsFilter = filter(['**/*.js'], {restore: true});
+
+    return gulp.src('assets/js/*.js')
+        .on('error', swallowError)
+        .pipe(sourcemaps.init())
+        .pipe(jsFilter)
+        .pipe(uglify())
+        .pipe(jsFilter.restore)
+        .pipe(sourcemaps.write('.'))
+        .pipe(gulp.dest('assets/built/'))
+        .pipe(livereload());
+});
+
 gulp.task('watch', function () {
     gulp.watch('assets/css/**', ['css']);
 });
 
-gulp.task('zip', ['css'], function () {
+gulp.task('zip', ['css', 'js'], function () {
     var targetDir = 'dist/';
     var themeName = require('./package.json').name;
     var filename = themeName + '.zip';
 
-    var jsFilter = filter(['**/*.js'], {restore: true});
-
     return gulp.src([
         '**',
         '!node_modules', '!node_modules/**',
         '!dist', '!dist/**'
     ])
-        .pipe(jsFilter)
-        .pipe(uglify())
-        .pipe(jsFilter.restore)
         .pipe(zip(filename))
         .pipe(gulp.dest(targetDir));
 });