Fixed crash in Vector.join() if one of the item was null.
Fixed crash when converting a null object to an int, double, etc… It should return default value instead of crashing.
Minor tweaks in debugger display for Expando and Dictionary so it is consistent with C# convention (and rest of the code).
Fixed incorrect toString() implementation. It was not using the override but always the object.ToString() implementation.
Per Flash reference, Player.LoadResource() returns a Sprite and not a Bitmap.
Fixed seemingly incorrect implementation of currentTarget in EventDispatcher.dispatchEvent().
Fixed probably incorrect implementation of Event.toString().
Fixed Dynamic.ConvertArgumentList() to support variadic parameters.
    Moved CSharpInvokeMemberBinder.ConvertMethodParameters to the dynamic class (we only need one good implementation).

    Fixed FindMethodForType() to also lookup for private methods.
Switched to CSharpBinaryOperationBinder2 because it is better than the previous binder.
Trying to mixup some funkiness with the pscorlib_aot project.
    Xamarin seemed to have moved a lot of files out of the folders in a previous commit. !?!
Various changes in stubs to help DJ implementation get further.