fix(forEach): add the array/object as the 3rd param like the native forEach

[jbedard]

This makes all the different object types supported by angular.forEach more like the native Array.forEach by adding the 3rd argument to the callback. Also adding tests to make sure all the different object types invoke the iterator with all 3 arguments and the context.

[Narretz]

I realize that you are using the describe to make the its less repetitive, but they are not really readable that way.

[jbedard]

@Narretz I've updated the tests, let me know if that's not what you meant.

I labelled this as a fix originally because it was inconsistent between arrays vs other object types (and IE8 vs other browsers). However 36625de made things much more consistent by not using Array.prototype.forEach at all. I'd still say angular.forEach should try to be consistent with Array.prototype.forEach though, just to do things the standard-like way and allow for the use of Array.prototype.forEach again in the future if it becomes faster then plain loops.

[IgorMinar]

I think it makes sense to get his in. it's a small change and having access to the original array can be useful if the iterator is not a closure that has access to the original collection.

[IgorMinar]

can you rename all of these too should follow the ES spec when called with array ?

[jbedard]

I've updated the test names.