No more ambient modules for tns-core-modules/* subpackages.

- Use path mappings in tsconfig.json to resolve module typings
- Only use ambient mobules for global API's
- Move single-file modules to a subdir with the same name so that
we can provide a hand-written typing next to it (via package.json)
- Delete all mentions of tns-core-modules.d.ts
- Delete reference d.ts assembly build steps. Not needed anymore.
- HACK! Use a <reference> for global typings in application.d.ts
to avoid publishing a separate @types/tns-core-modules package.
- Rename declarations.d.ts to tns-core-modules.d.ts to preserve
JS project mappings in references.d.ts (the only place we use those)

tns-core-modules/js-libs/polymer-expressions/package.json

@@ -1,2 +1,5 @@
-{ "name" : "polymer-expressions",
-  "main" : "polymer-expressions" }
+{
+  "name" : "polymer-expressions",
+  "main" : "polymer-expressions",
+  "types" : "polymer-expressions.d.ts"
+}

tns-core-modules/js-libs/polymer-expressions/polymer-expressions.d.ts

@@ -1,16 +1,14 @@
 //@private
-declare module "js-libs/polymer-expressions" {
-    class PolymerExpressions {
-        static getExpression(expression: string): Expression;
-    }
+export class PolymerExpressions {
+    static getExpression(expression: string): Expression;
+}
 
-    class Expression {
-        /**
-         * Evaluates a value for an expression.
-         * @param model - Context of the expression.
-         * @param isBackConvert - Denotes if the convertion is forward (from model to ui) or back (ui to model).
-         * @param changedModel - A property bag which contains all changed properties (in case of two way binding).
-         */
-        getValue(model, isBackConvert, changedModel);
-    }
-}
+export class Expression {
+    /**
+     * Evaluates a value for an expression.
+     * @param model - Context of the expression.
+     * @param isBackConvert - Denotes if the convertion is forward (from model to ui) or back (ui to model).
+     * @param changedModel - A property bag which contains all changed properties (in case of two way binding).
+     */
+    getValue(model, isBackConvert, changedModel);
+}