Fix bdist_wheel. Add Tag information to WHEEL dist info.

Related: http://lepture.com/en/2014/python-on-a-hard-wheel
ENH to_latex mi index will use & sep for levels
ENH: Add duplicated/drop_duplicates to Index
Clarification to .ix functionality
Made clear that .ix does not support positional indexing
in the case where the corresponding dimension has an
integer index.
New "ambiguous" argument in tz_localize to enhance support for ways of resolving transition times ('infer', dot indicators, 'NaT', and 'raise')
Merge pull request #7963 from rockg/master

Support is_dst indicators in tz_localize
ENH: SQL support for writing NaN + datetime64 values (GH2754, GH7103)

Cast values to object dtype converts to native python types.
For datetime64 columns these are converted to datetime.datetime
which also fixes the datetime64 issue (supercedes PR GH8205).
NaN issue is solved by converting all NaN values to None.
ENH: refactor to_sql insert_data - performance improvement (GH8208)
Merge pull request #8208 from jorisvandenbossche/sql-2754-nan

ENH: sql support for writing NaN + datetime64 values (GH2754, GH7103)
ENH: TimedeltaIndex and Timedelta scalar support (GH3009)

BUG: coercion of timedeltas in assignment (GH8209)

COMPAT: provide conversion for passing in non-ns datetime64/timedelta64

BUG: diff on Dataframe with timedelta64 broken (GH4533)

ENH: support for alternate Timedelta format constructors in natural language (GH8190)

BUG: handle empty timedelta64[ns] Series with ops (GH7869)
Merge branch 'master' of https://github.com/grechkay/pandas-1 into grechkay-master
DOC: Added warning about attribute access on 'reserved' words (GH8082)
Merge pull request #8184 from jreback/tdi

ENH: create Timedelta scalar / TimedeltaIndex
BUG: Bug in inference in a MultiIndex with datetime.date inputs (GH7888)
Merge pull request #8264 from jreback/mi

BUG: Bug in inference in a MultiIndex with datetime.date inputs (GH7888)
DOC: v0.15.0 edits
Merge pull request #8066 from lepture/bdist-wheel

Fix bdist_wheel. Add Tag information to WHEEL dist info.
Merge pull request #8219 from hayd/latex_mi_index

ENH to_latex mi index will use & sep for levels
TST: tests for reduction of series with nan timedelta (GH7661)
Merge pull request #8268 from jreback/nat

TST: tests for reduction of series with nan timedelta (GH7661)