Renamed com.colapietro.* to org.colapietro.*
Added final keyword to main method's injector variable.
Moved constants to a separate file.
Refactored to define game loop using interface.
Added Apache 2.0 License.

Closes #37
Added NotImplementedException from Commons Lang library.

Also added ident attribute for java files.
Added in diff=java for java files.
Added abstract class for game loop.
Added Javadoc comments.