travis: new ROOT builds with roofit enabled
remove accidental comma
travis: install root_numpy
travis: no need to set ROOTSYS in env
travis: pip install --user
travis: update ROOT build script
travis: re-enable 5.32.04 build
travis: fix ROOT dl urls
Add _DirectoryBase.objects(cls)
Merge pull request #331 from ndawe/travis

MRG: update builds for travis
Merge pull request #332 from pwaller/dir-all

Add _DirectoryBase.objects(cls)
Support slice assignment for Hists
Test new histogram slice assignment