feat(compiler): add TemplateCompiler

TemplateCompiler is the entry point to the new compiler

Related to #3605
Closes #4220

modules/angular2/src/transform/template_compiler/change_detector_codegen.ts

@@ -7,6 +7,7 @@ import {
 // TODO(tbosch): Move the corresponding code into angular2/src/compiler once
 // the new compiler is done.
 export class Codegen {
+  constructor(moduleAlias: string) {}
   generate(typeName: string, changeDetectorTypeName: string, def: ChangeDetectorDefinition): void {
     throw "Not implemented in JS";
   }