SCR: add a script for tracking down all commits touching a named method
Merge pull request #3316 from y-p/tooling_find_touchy

SCR: add a script for tracking down all commits touching a named method
BUG: fix to_html double escaping
BUG: fix integer division operator under py3 in rplot
DOC: Try and clarify tz_localize docstring, always found it confusing
CLN: moved all data for tests to /data sub-dir of the tests
ENH: added legacy pickel generation/testing suppport

TST: added io/tests/test_pickle.py to test stored pickles
     added io/tests/generate_legacy_pickles.py to create legacy pickles
       on various arch and sytems (need contributions)
     added some sample pickles for 0.10.1/0.11.0
BLD: fix setup.py to load correctly data files
BUG: reading py2 pickles in py3 ok now