Merge pull request #306 from pwaller/asrootpy-classes

Support passing classes to asrootpy
filter warnings for all hist types and dimensions
remove _PadBase.members and OwnMembers
Pad improvements and fix loading of TH1 in quickroot
Merge pull request #313 from ndawe/master

MRG: Cleanup and a few minor improvements
rootpy.types -> rootpy.tree.treetypes
Merge pull request #314 from ndawe/master

MRG: types -> tree/treetypes.py
Provide rootpy-like TObjArray and TList
Don't include TObject in the registry