BUG: apply Timestamp to resultant datetimes when operating on offsets
CLN/ENH: Stop instantiating all offsets on load.

Use a more flexible lookup based on prefix then delegate creation to
class' `from_name()` method. Totally get rid of hasOffsetName (not necessary).
Finally, make some inheriting go on to simplify things.
API: rename _prop_attributes to __finalize__ (in NDFrame)
     rename _propogate_attributes to _metadata (in NDFrame)
     change methods which directly pass metadata to use __finalize__

     These provide a simple mechanism for meta data propagation, which
     can be overriden in subclasses if desired
fixed business day calculation
BUG: Groupby filter maintains ordering, closes #4621
Merge pull request #5222 from danielballan/filter-maintains-ordering

BUG: Groupby filter maintains ordering, closes #4621
Merge pull request #5179 from jacobschaer/master

GBQ: Updated Documentation, and added method to generic.py
Merge pull request #5205 from jreback/meta

API: rename _prop_attributes to __finalize__ (in NDFrame)
Merge pull request #5189 from jtratner/stop-instantiating-offsets-on-load

CLN/ENH: Stop instantiating all offsets on load.
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)
Merge pull request #5227 from jreback/enlarge_empty

BUG: allow enlargement to work with empty objects (GH5226)
Merge branch 'bdays_fix' of https://github.com/wuan/pandas into wuan-bdays_fix
Add a convenience function to compile pandas ready for doc-building
Add some new entries to API doc
Merge pull request #5124 from JanSchulz/API_additions

Add indexer and str to API documentation
BUG/CLN: MI now checks level & label compatibility

Via verify_integrity kwarg. Internals all pass False.

CLN: Verify integrity by default on label/level setting