Load tower placement from map.tmx handle AotEvent in hud
Implementing new widget gameover
Game Over screen and game mecanics
Game mecanics improved, drawing reorganized, better use of events
some doc added
Back to selectlevelscreen when level was succefully complete
Merge branch 'music'

Conflicts:
	age-of-tower/src/com/nsx/ageoftower/screen/GameScreen.java
	age-of-tower/src/com/nsx/ageoftower/utils/Foe.java

Signed-off-by: xclam <romain.rj@gmail.com>
Bug correction : throw a null pointer exception when
Foe reach the last point

Signed-off-by: xclam <romain.rj@gmail.com>
Manage sound in hud

Signed-off-by: xclam <romain.rj@gmail.com>