Move css and css-value modules to the toplevel.

This is the default location when installing from npm, and Angular uses
that when parsing CSS.

Updated module paths, requires, csproj, tsconfig and grunt tasks.

ui/styling/css-selector.ts

@@ -1,6 +1,6 @@
 import view = require("ui/core/view");
 import observable = require("ui/core/dependency-observable");
-import cssParser = require("js-libs/reworkcss");
+import cssParser = require("css");
 import styleProperty = require("ui/styling/style-property");
 import trace = require("trace");
 
@@ -186,4 +186,4 @@ class InlineStyleSelector extends CssSelector {
 export function applyInlineSyle(view: view.View, declarations: cssParser.Declaration[]) {
     var localStyleSelector = new InlineStyleSelector(declarations);
     localStyleSelector.apply(view);
-}
+}