brush system demo

[adrix89]

I've been working on a drawing application and why not share the progress so far.
You NEED the absolutely newest version of love 0.8 beta,which you can get here http://love2d.org/builds/
You can still use 0.7.2 with some minor changes but without premultiplied blend mode brush doesn't work properly.

left mouse to draw,right mouse to fill,middle to move and wheel to zoom
tab switches brush draw modes
keypad to focus on a part,kp5 is default
(space) uses old brush model and was doing some color blending stuff with it,my current build still has a flip bug
Escape will 'q' event