Merge pull request #5 from bartek/master

Physics / Scene module updates
actors now have collisionrect of a different size
Merge pull request #6 from bartek/master

Add early MVP of Dispatcher.
Merge pull request #7 from bartek/master

physics / input
merged with remote
Merge branch 'master' of https://github.com/plorry/gramework
parallax scrolling; nbd
brief documentation added inline for scrolling
bugfix from previous commit
do not draw tile layers without draw=true property
early simple particle system created
removed file
Update .gitignore
Camera now takes a rect, not an object with a rect.