Overhauled saving

It now works properly on Android. Saving is done automatically when the application is paused.
Merge branch 'master' of https://github.com/siketh/COP4331_Project
Fixed tower 3 texture
Merge branch 'master' of https://github.com/siketh/COP4331_Project
Changed Android Icons
Merge remote-tracking branch 'origin/master' into Cole