Migrates jquery-ui to npm package

jquery-ui has been updated in the regristry to point to npm:jquery-ui
instead of github:components/jqueryui.

Further, package-overrides that pointed at the github:components version
of both jquery-ui and jquery have been updated to rely on the npm version
of the package.

Fixes #1008

package-overrides/github/CodeSeven/toastr@2.1.1.json

@@ -2,7 +2,7 @@
   "main": "toastr",
   "format": "global",
   "dependencies": {
-    "jquery": "github:components/jquery",
+    "jquery": "npm:jquery",
     "css": "github:systemjs/plugin-css"
   },
   "files": ["toastr.js", "toastr.css", "build"],