Merge pull request #5 from crumblingstatue/master

WitchBlastGame: Initialize title in member init list
ADD New Monster : Bubble
FIX Falling Rock box display
CanCollide() is now public
ADD Chest's trap
FIX Target fairy shoots at invisible monsters
Update readme.txt
MOD Change  the way rooms are positionned

on the floor
MOD Better bubble collisions
ADD Challenge rooms
ADD Populates challenge room
ADD Challenge room's door
ADD Challenge room's on the minimap

and little code refactoring
ADD New Item Elven Cookie

and code refactoring
FIX Player's HP > HP max

when eating a bonus health item
ADD Reward in the challenge room
ADD New items : Fire gem + ring

And fire shot implementation
ADD Player method to know if he can get

a new shot type
ADD Egg' smash and spider walk sound
MOD Boss chest drop bonus health item when none

other is available