Merge pull request #3 from crumblingstatue/master

Use a globally accessible WitchBlastGame object
ADD Frozen bolt light aura and fire delay
ADD Readme.txt update
FIX Slime dying while jumping

Slimes do not "disappear" when they are jumping and lost the last HPs,
they "die" when they reach the ground.
ADD Sound when the ice bolt is charged
ADD "One button" Gameplay

It is now possible to play with only one "fire" button. Default is
[space].
Pressing the button fire in the player facing direction, so long that
the button is pressed.
ADD comments for the WitchBlastGame class
MOD Get rid of the Static Text Singleton
ADD More items properties

Alignment, can be in a shop, level, pre-requisite
Cleaning, comments, re-factoring...
MOD No more double line on the minimap
ADD Shot slots implementation

To enable to have different selectable bolt types
ADD Switch shot type
MOD Ice gem cannot be preloaded
ADD HUD for the shot types
MOD Tiles collision
ADD New item :  Illusion Gem
ADD New graphics for the player
FIX Hat and amulet not displayed in acquiring stance
Update readme.txt