Enhancements in armature handling.

- Switched to Scala 2.10.3 and verified Java8 compatibility.
- Avatar states are sent both to Spaces and Renderers, not only one of
them.
- IsoCellGrid now is configurable for the shape and size of the cells.
- IsoEntity allows to add armatures.
- IsoLayers allow to cut the rendering in passes.
- IsoWorld now can handle animations.
- Scale of armatures can now be configured from XML and from
Libraries/Resources.
- An SVG armature file can now contain several armatures, and therefore
several layers for each armature description, only indicate the name of
the layer to use when loading the armature or via Libraries/Resources
or the XML resource file.