ngMock window.inject doesn't return value from function

[stalniy]

I'd like to use lazy vars interface for mocha.js (https://github.com/stalniy/bdd-lazy-var) and write like this

describe('My Controller', function() {
   def('scope', inject(function($rootScope) {
      return $rootScope.$new();
   }));

   it(...)
})

This doesn't work as inject doesn't return the value from function which it wraps. I checked the source code and I see that inject able to inject services into functions which are passed as multiple arguments.

That's a pretty rare case from my point of view. But in order to leave backward compatibility we can store returting values and if passed only 1 function return the value returning by injector.invoke(....)

Let me know if you are ok with this fix! If so, I will create pull-request