* Upgrading to latest jme 3, still some issues.

* Moving from eclipse to intellij therefore optimized imports and code
reformatting.
* Renaming resources folder to assets.
* Moving files around appropriately within the assets folder, removing
unusedd stuff.
* Generating javadoc.
* Some stuff is now in jme deprecated, will need to be handled (like
shadow renderer).
* Updating gitignore for intellij.