only create tree buffer if requested or if __iter__ is called
minor edits
_rootpy_dictionary_already_exists returns false positives
Add ROOT 5.32 build for travis-ci.

This .travis.yml file is also Python 3 ready, just uncomment the line
with 3.2 at the top.
I basically took this .travis.yml file from root_numpy.
Install matplotlib and pytables for Python 2.7, not 3.2
Merge pull request #109 from ndawe/tree

only create tree buffer if requested
merge rootcint.py into stl.py
Merge pull request #111 from ndawe/rootcint_merge_stl

merge rootcint.py into stl.py
fix registry for Vector2 and Vector3
Merge pull request #112 from ndawe/master

AttributeError: 'module' object has no attribute 'TVector2' in lookup_by_name
Remove code which should never have made it in
Merge pull request #113 from pwaller/bugfix

Remove code which should never have made it in
Falling back to batch mode should be a WARNING not ERROR
stl: Compute dicts path at module import time
stl: generate should be a staticmethod (fix #111)
Merge pull request #115 from pwaller/batch-msg

ROOT: Falling back to batch mode should be a WARNING not ERROR
Merge pull request #114 from pwaller/bugfixes

A couple of bug fixes to make tests pass
Add some utility functions
Excise root_numpy
Add log.showdeletion() to show TObject cleanup