Plays a sound when changing volume.
Merge branch 'master' of github.com:GL-MPRI-2014/GL_MPRI_2014

Conflicts:
	src/interface/SettingsScreen.ml
Fixed damage calculations
init return players*map
Merge branch 'master' of https://github.com/GL-MPRI-2014/GL_MPRI_2014
Merge branch 'master' of github.com:GL-MPRI-2014/GL_MPRI_2014
Merge branch 'master' into script_dev

Conflicts:
	src/engine/Game_engine.ml
	src/engine/Game_engine.mli