Use sprite instead of individual images

Main Features:

• Use sprite instead of individual images 908a7c7
• 1.5.1 compatibility 1db3c19
• Bower package

Preload image before inserting to DOM

• Preload image before inserting to DOM. This should fix resizing bug.
• Add minified version.
• Improve demo.
• Rebuild mootools more in demo.

Initial release

v0.1.0

Bump to version v0.3.0