Added closed parameter to the DatetimeIndex constructor.
BUG: (GH4708) A zero length series written to HDF cannot be read back.
Merge branch 'date_range' of https://github.com/filmor/pandas into filmor-date_range

Conflicts:
	doc/source/release.rst
	pandas/tseries/offsets.py
Merge branch 'AHLRAP-3081' of https://github.com/prossahl/pandas into prossahl-AHLRAP-3081
BUG: allow enlargement to work with empty objects (GH5226)