RussianModel & Constants.NEED_LEVEL_FULL

Also added RussianActivity
RussianActivity added, methods in MainActivity
russian roulette can be played (but bugs)
DrinkHappyPotion works except CrayCray-expression
added constants for death causes
right deathcause when killed by russian
buttons disabled when dead
ALL buttons now disabled when dead

forgot happypotion and russian last time
small changes
merge
Merge branch 'russian' into Dev
no changes
mergefix
Merge branch 'Dev' into ill_feature

Conflicts:
	CrayCray/res/layout/activity_main.xml
	CrayCray/src/se/chalmers/dat255/craycray/activity/MainActivity.java
	CrayCray/src/se/chalmers/dat255/craycray/model/NeedsModel.java