chore(core): move compiler out of core

BREAKING CHANGE

All imports from 'angular2/core/compiler' should be changed to 'angular2/compiler'.

modules/angular2/src/compiler/source_module.ts

@@ -0,0 +1,44 @@
+import {StringWrapper, isBlank} from 'angular2/src/core/facade/lang';
+
+var MODULE_REGEXP = /#MODULE\[([^\]]*)\]/g;
+
+export function moduleRef(moduleUrl): string {
+  return `#MODULE[${moduleUrl}]`;
+}
+
+export class SourceModule {
+  constructor(public moduleUrl: string, public sourceWithModuleRefs: string) {}
+
+  getSourceWithImports(): SourceWithImports {
+    var moduleAliases = {};
+    var imports: string[][] = [];
+    var newSource =
+        StringWrapper.replaceAllMapped(this.sourceWithModuleRefs, MODULE_REGEXP, (match) => {
+          var moduleUrl = match[1];
+          var alias = moduleAliases[moduleUrl];
+          if (isBlank(alias)) {
+            if (moduleUrl == this.moduleUrl) {
+              alias = '';
+            } else {
+              alias = `import${imports.length}`;
+              imports.push([moduleUrl, alias]);
+            }
+            moduleAliases[moduleUrl] = alias;
+          }
+          return alias.length > 0 ? `${alias}.` : '';
+        });
+    return new SourceWithImports(newSource, imports);
+  }
+}
+
+export class SourceExpression {
+  constructor(public declarations: string[], public expression: string) {}
+}
+
+export class SourceExpressions {
+  constructor(public declarations: string[], public expressions: string[]) {}
+}
+
+export class SourceWithImports {
+  constructor(public source: string, public imports: string[][]) {}
+}