Deprecate cols in to_csv, to_excel, drop_duplicates, and duplicated.  Use decorator.  Update docs and unit tests. [fix #6645, fix#6680]
DOC: add to docstring of core/groupby/Grouper
BLD: use numpy 1.8.1 in 2.7 build
     use scipy 0.13.3 in 3.3. build
BLD: move sql libs up in requirements to facilitate building wheels
dataframe bar plot can now accept align keyword
Merge pull request #6691 from sinhrks/bar_center_pr

ENH/VIS: Dataframe bar plot can now handle align keyword properly