Mavenization of the project and Java7 compatibility

Hello Fabien,

I was deeply inspired by you blog posts and started using Prototyp to learn basics of game engine programming as well as LWJGL.  The code in your repository works with Java6, but it does not work with Java7 due to outdated LWJGL library.  I mavenized the project and added more recent version of LWJGL as a dependency.  I also added a plugin for native dependencies.  Maven project is easy to import in any major IDE (Eclipse, IntelliJ IDEA, Netbeans).  The code and assets are unchanged in this pull request, only the project structure is modified.

Please consider my pull request.

Thanks,
Den