Updated some scenes to have Android back button functionality
Merge branch 'master' of https://github.com/jcvno/ToTheTop
Added start images for future use
Merge branch 'master' of https://github.com/jcvno/ToTheTop
Grid level selector framework set up
Merge branch 'master' of https://github.com/jcvno/ToTheTop
Difficulty selection change
Removed unnecessary skybox graphics
Updated hearts to scale according to screen size
Pull from master
Fixed sounds
Merge pull request #27 from connienguyen/master

[connienguyen merge] added level selection menu