feat(compiler): new semantics for template attributes and view variables.

- Supports `<div template=“…”>`, including parsing the expressions within
  the attribute.
- Supports `<template let-ng-repeat=“rows”>`
- Adds attribute interpolation (was missing previously)

modules/change_detection/test/change_detector_spec.js

@@ -18,7 +18,7 @@ import {Record} from 'change_detection/record';
 export function main() {
   function ast(exp:string) {
     var parser = new Parser(new Lexer(), new ClosureMap());
-    return parser.parseBinding(exp);
+    return parser.parseBinding(exp).ast;
   }
 
   function createChangeDetector(memo:string, exp:string, context = null, formatters = null) {