fix for plugin engine
Merge branch 'dev' of https://github.com/sunriseJS/sunriseJS into dev

# By JGerdes
# Via JGerdes
* 'dev' of https://github.com/sunriseJS/sunriseJS:
  level1 is used in game
  levels are actually loaded
  Stage will find level object itself by name
  resource loaded is able to load levels
  Added simple ajax function to util
  renamed map to level
  fixed wrong dimensions
  Stage is able to draw maps (from spritesheets)
  improved walking in testgame
plugin engine, will emit 'all_plugins_loaded' into the rootScope when all plugins are fully loaded.
example plugin for testing purpose:P

Closes #4