fix(core): typo ComponetRef -> ComponentRef

Closes angular#1426

Author: vicb

modules/angular2/core.js

@@ -16,7 +16,7 @@ export * from './src/core/compiler/compiler';
 // TODO(tbosch): remove this once render migration is complete
 export * from 'angular2/src/render/dom/compiler/template_loader';
 export * from './src/core/compiler/dynamic_component_loader';
-export {ElementRef, ComponetRef} from './src/core/compiler/element_injector';
+export {ElementRef, ComponentRef} from './src/core/compiler/element_injector';
 export * from './src/core/compiler/view';
 export * from './src/core/compiler/view_container';