General reorganization

I re-organized things a bit, so that its a little more general-prupose:

-- the einstein-head demo was moved to the einstein directory
-- the blender directory installs blender only, and does not run any ROS nodes
-- the main indigo docker was renamed to ros-indigo-base (as opposed to ros-indigo-deps) and trimmed down a bit.
-- the ros-indigo-dev no inherits from base, not deps

The goal here is to allow additional HR robots to come online; these need ROS+blender, without the other stuff.