Updating

Hi, I needed to track down some GWT errors - as a result I've updated the repo so that the GWT target works and some other small stuff:
- mapper variables have more meaningful names
- bumped artemis to 0.6.5
- bumped libgdx to 1.2.0/1.1.0 (for asset creation)
- `@Wire` replaces `@Mapper`

I haven't tested the iOS build though.

The deprecated artemis methods should probably be replaced with their appropriate libgdx counterparts or updated artemis methods, but I thought it could wait.