refactor(pipes): use Injector instead of pipe factories for pipe instantiation

BREAKING CHANGE
    - Pipe factories have been removed.
    - PIpe names to pipe implementations are 1-to-1  instead of 1-to-*

 Before:
     class DateFormatter {
         transform(date, args){}
     }

     class DateFormatterFactory {
       supporst(obj) { return true; }
       create(cdRef) { return new DateFormatter(); }
     }
     new Pipes({date: [new DateFormatterFactory()]})

After
    class DateFormatter {
      transform(date, args){}
    }
    new Pipes({date: DateFormatter})

modules/angular2/src/core/application_common.ts

@@ -137,7 +137,7 @@ function _injectorBindings(appComponentType): List<Type | Binding | List<any>> {
     Compiler,
     CompilerCache,
     ViewResolver,
-    bind(Pipes).toValue(defaultPipes),
+    defaultPipes,
     bind(IterableDiffers).toValue(defaultIterableDiffers),
     bind(KeyValueDiffers).toValue(defaultKeyValueDiffers),
     bind(ChangeDetection).toClass(bestChangeDetection),