jsoncpp: version 0.6.0-rc2 added to project
jsoncpp: fix build errors
afutil: implementing RUBE importer

RUBE is an AWESOME Box2D editor, we'll use
it to create our worlds, enemies and other game objects.
Thus, we need to implement:
* RUBE importer - reads json with jsoncpp, parses
  and creates RUBEWorld
* SceneObjectAsserManager - gets RUBEWorld for an object
  and creates SceneObject from it
* SceneAssetManager -  gets RUBEWorld and populates the scene
  with objects and joints from that world

After this we'll be able to create content in RUBE, not only
in lua scripts. lua scripts together with RUBE will provide
a very powerfull set of content creation tools