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.

css/reworkcss.d.ts

@@ -0,0 +1,31 @@
+declare module "css" {
+    export interface Position {
+        start: { line: number; column: number };
+        end: { line: number; column: number };
+    }
+
+    export interface Node {
+        type: string;
+        position: Position;
+    }
+
+    export interface Declaration extends Node {
+        property: string;
+        value: string;
+    }
+
+    export interface Rule extends Node {
+        selectors: string[];
+        declarations: Declaration[];
+    }
+
+    export interface StyleSheet {
+        rules: Rule[];
+    }
+
+    export interface SyntaxTree {
+        stylesheet: StyleSheet;
+    }
+
+    export function parse(css: string, options: any): SyntaxTree;
+}