pathfinding order, closes #17
Create tile.js

Tile backend.
Merge pull request #21 from troygilbert/patch-1

Create tile.js
Tile backend refactoring
switched to requestAnimationFrame (+polyfill)
docs
drawing multiple chars at once
tile offsets in pixels
makefile, setOptions in cellular
makefile finishing
(make dist automatic commit)
makefile
addons
addons
support for promises in rot.engine
addons tuning
addons readme
textbuffer addon
fixes #24
unit test for issue #24