Add apachetests, localtests: AJAX does not work on "localfile".
Change filename: pelotarebota to ballbounces.
Code inside domReady: main.coffee.
Fix names and paths: GravityMiniExample.coffee.
Change title on tests.html: Spanish to English.
Fix events name of preloadjs: GravityMiniExample.coffee.
Change name from spanish to english: index.jade, tests.html.
Change libs from build/ to src/: css, js.
Fix doc of GravityMiniExample and data_path.
Move classes to js/classes/.
Remove some comments.
Remove Ball class from main.coffee.
Add frame property to Ball class.
Move Ball and Stage intance to GravityMiniExample.
Execute tests on document ready, add canvas in tests.html.
Add adjustGameScreen method and executed onWindowResize: GravityMiniExample.