Start making the way toward v0.0.3
 - Remove old eburp/gurk maps and environment textures.  Replace with dungeon/sewer/volcanic dungeon tileset from http://opengameart.org/content/sewer-tileset
 - Update Tiled map loader to support arbitrary numbers of tile layers, and multiple tile set files.
 - Remove pow2 "sprite" system reference to map textures.  Sprite system is for working with sheets generated by the sprite packer, doesn't really work with existing sheets because there are no logical names for individual tiles.   They're just referenced by global ID and call it a day.
Stash WIP for female ninja in sewer map.
TODO:
 - Metadata for tiles/types (collision, etc.)
 - Rework playerRender to use a .playAnimation("name") based on direction, instead of assuming a particular cell structure from an image map.
grunt-notify: yep always
Angular, stop hating my game:
 - Make use of ng-if to keep active angular watch trees to a minimum.
 - Delete level stats view and styles.
 - Remove outdated menu styles.
Remove combat view background sprite.
Make sewere safe while developing.
Don't forget super in interpolateTick, AnimatedComponent!
Add scaffolded support for more generic player animations in playerRenderComponent.
Move crazy animator into core/ and out of playerRenderComponent.
Don't play animation when player is not moving.
Add in the other players from the OGA character sets.
Remove third party libs from repo, and rely on Bower to install them.
Remove Facebook auth code.
Update npm install to install bower components after it's done, and build sprites/source outputs so that `grunt watch` may be run immediately afterward.
Merge branch 'oga-art' into develop