several fixes in configuration caches
Merge branch 'cache' of https://github.com/rdiankov/openrave into cache
Added environment updates (remove collisions with a particular body, reset cache when a body is added) to the cachechecker. AddRemoveCallback fix by Rosen in environment-core.h. Speed ups, added more tests to test_configurationcache.py. Added new commands to cachechecker.cpp
Merge branch 'cache' of https://github.com/rdiankov/openrave into cache