MJPEG viewer

* Streaming of random webcam using a in-house class (I couldn't find any worth alternative and I wanted to avoid using the UI* objects since they're not coping well with sparrow).
* Some leaks solved, some of them are still present but I'm thinking is due to the SPBitmapChar class to render bitmap fonts, I'm investigating though, it seems like there are a couple of issues opened.
* Redesign the InputGameScene scene in order to maximise the screen real estate and use 640x480 resolution for Webcams (whereas before beginning this develop I just had 200x100 pixels free :ice_cream: )

__No tests have been added, due to the fact that I have worked 90% on the UI and 10% on non-testable things (like, graphic elements interacting)__, in the next Milestone I will add more tests even on UI using OCMock (I have to study the framework before).

That should be all.