BUG: add fix for opening zero observation dta files
DOC: update DF.as_matrix and DF.values.  Closes gh7413
_sanitize_column now reports proper duplicate error
CLN: use np.array(arr,copy=False) where possible
Merge branch 'issue_7432_resolve' of https://github.com/roblevy/pandas into roblevy-issue_7432_resolve
ERR: fixup exception reports for duplicate axis reindexing, related (GH7432)
Merge branch 'fix_empty_open' of https://github.com/bquistorff/pandas into bquistorff-fix_empty_open

Conflicts:
	doc/source/v0.14.1.txt
BUG: resample raises ValueError when NaT is included
DOC: Add how to calculate month-start to cookbook

Related: #7449
Merge pull request #7417 from clham/7413

DOC: update df.as_matrix and df.values.  Closes gh7413
FIX integer column names for older sqlalchemy version GH6340, GH7330
Merge pull request #7456 from jorisvandenbossche/sql-fix7330

FIX integer column names for older sqlalchemy version GH6340, GH7330
BLD: use sqlalchemy 0.7.1 in 2.6 build (GH6340)
Merge pull request #7455 from shoyer/month-start-cookbook

DOC: Add how to calculate month-start to cookbook
Merge pull request #7022 from jreback/sqlalchemy

BLD: use sqlalchemy 0.7.1 in 2.6 build (GH6340)
Merge pull request #7373 from sinhrks/resamplenat

BUG: resample raises ValueError when NaT is included
nanops pep8 fixes