fix(di): allow injecting event emitter fns without specifying type annotation

Fixes #965

Closes #1155

modules/angular2/src/core/annotations/di.js

@@ -12,6 +12,10 @@ export class EventEmitter extends DependencyAnnotation {
     super();
     this.eventName = eventName;
   }
+
+  get token() {
+    return Function;
+  }
 }
 
 /**
@@ -25,6 +29,10 @@ export class PropertySetter extends DependencyAnnotation {
     super();
     this.propName = propName;
   }
+
+  get token() {
+    return Function;
+  }
 }
 
 /**

modules/angular2/src/di/annotations.js

@@ -107,6 +107,10 @@ export class DependencyAnnotation {
   @CONST()
   constructor() {
   }
+
+  get token() {
+    return null;
+  }
 }
 
 /**

modules/angular2/src/di/binding.js

@@ -135,7 +135,11 @@ function _extractToken(typeOrFunc, annotations) {
       optional = true;
 
     } else if (paramAnnotation instanceof DependencyAnnotation) {
+      if (isPresent(paramAnnotation.token)) {
+       token = paramAnnotation.token;
+      }
       ListWrapper.push(depProps, paramAnnotation);
+
     } else if (paramAnnotation.name === "string") {
       token = paramAnnotation;
     }