I added the killable interface.

I added a kilable interface
Some Runner Updates
I coded the ground class.
Merge branch 'master' of https://github.com/Dominionized/RunRunnerRun
Runner is no more falling
Setters and Getters
Merge branch 'master' of https://github.com/Dominionized/RunRunnerRun into scroll
Runner arrangements
Merge branch 'master' of https://github.com/Dominionized/RunRunnerRun into scroll

fdsafsaf
Added Grass.java
Merge branch 'master' into scroll

merge master
Epic commit
Runner arrangements
GameObject.java
Runner arrangements
ScrollHandler
Merge remote-tracking branch 'origin/scroll'
added song
Merge remote-tracking branch 'origin/sound'
Merge branch 'master' of https://github.com/dominionized/RunRunnerRun into sound