BUG: fixed remaining sparse issue (SpareDataFrame was converting SparseArray incorrectly)
BUG: dtypes in groupby nth fixed (converting on aggregation item_by_item)
BUG: partial fix on groupby?

BUG: restored groupby back to master (SeriesGrouper)

BUG: more fixes on groupby

BUG: fixed all groupbys!
BUG: get_median in core/nanops.py complaining
PERF: made constructions of SparseFrame have less redundant steps
PERF: minor series perf improvement
TST: trying to fix how_lambda in tseries/resample

     PTF
PERF: addtl groupby multi_python perf improvements
COMPAT: py3 compat fixes

TST: recover pickles in a particular order or names
PERF: speeds up for Series.__getitem__

PERF: some perf on groupby.....

      added _block, _values in SingleBlockManager

PERF: more reducer improvements

BUG: fixed SeriesBinGrouper hopefully
TST: stats.tests.test_ols/test_wls is not testing for the correct version

     of statsmodels (fails on 32-bit)

     PTF

TST: make sure to skip the test_wls if our version isn't enough