More cleaning up code.
Removed NGUI.
Lots more refactoring, also added image animation script to animate UGUI images.
Refactored kraken animation and creation code.
Kraken disaster should anchor right across multiple screen sizes now.
Kraken splash particles look and layer correctly.
Refactored BuildManager code, and added new prefabs for buildings and their explosions.
Disasters are now instantiated prefabs rather than components added to Gameplay script.
Kraken now shows up correctly when spawned. Hooked up disaster countdown text, and switched in new fonts.
Added back rest of the building slots.
Modified some build settings.