TST: fix for tseries/test_period for py3k
Merge pull request #3204 from jreback/period_py3

TST: fix for tseries/test_period for py3k
ENH: add __ne__ method to period comparisons

BUG: fix in spare_frame for issue with running apply on a SparseFrame didn't
     allow the setting of the columns with a rename to work properly
     something broke this......
Merge pull request #3205 from jreback/tests_fix

TST: fix tests in master
CLN: refactor core/index and tseries/index,period to have their formats and to_native_types be consistent
     in naming / operation
ENH: add support for Period formatting (as a native type)
TST: add period support to makeCustomDataFrame for testing purposes
BUG/TST: format multi-index nan correctly
Merge pull request #3193 from jreback/index_fmt

CLN: refactor core/index and tseries/index,period to have their format, to_native_types methods consistent