feat(assertArgFn): should support array annotated fns

Author: IgorMinar

src/Angular.js

@@ -959,7 +959,11 @@ function assertArg(arg, name, reason) {
   return arg;
 }
 
-function assertArgFn(arg, name) {
+function assertArgFn(arg, name, acceptArrayAnnotation) {
+  if (acceptArrayAnnotation && isArray(arg)) {
+      arg = arg[arg.length - 1];
+  }
+
   assertArg(isFunction(arg), name, 'not a function, got ' +
       (arg && typeof arg == 'object' ? arg.constructor.name || 'Object' : typeof arg));
   return arg;