Added unitypackage link for uGUI frontend

Pretty much only handling of focus left to fix and I gotta find some info about that for uGUI. After that it should work just as well as the nGUI except for colourcoded text. uGUI supports richtext for colouring but I haven't played with it yet.
Merge pull request #8 from MuNgLo/patch-1

Added unitypackage link for uGUI frontend