Enhance Gulp dependency compilation

Gulp automatically grabs all of the dependencies listed as main files in
`bower.json` except for jQuery and modernizr

Deletes plugin directory, bad development pattern. Doesn't make sense
with the existence of `vendor` directory anyway.

Concat all of the js in the js directory except vendor and compiled
files

package.json

@@ -27,6 +27,7 @@
     "gulp": "^3.8.7",
     "gulp-autoprefixer": "^0.0.7",
     "gulp-concat": "^2.3.4",
+    "gulp-filter": "^0.5.0",
     "gulp-grunt": "^0.5.2",
     "gulp-jshint": "^1.8.4",
     "gulp-less": "^1.3.3",
@@ -34,10 +35,12 @@
     "gulp-load-plugins": "^0.5.0",
     "gulp-minify-css": "^0.3.7",
     "gulp-modernizr": "https://github.com/doctyper/gulp-modernizr/tarball/develop",
+    "gulp-plumber": "^0.6.3",
     "gulp-rename": "^1.2.0",
     "gulp-rev": "^1.1.0",
     "gulp-sourcemaps": "^1.1.1",
     "gulp-uglify": "^0.3.1",
-    "jshint-stylish": "^0.4.0"
+    "jshint-stylish": "^0.4.0",
+    "main-bower-files": "^1.0.1"
   }
 }