DOC: make api docs reflect api usage (#4539)
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.
Merge pull request #5208 from jorisvandenbossche/doc-currentmodule

DOC: make api docs reflect api usage (#4539)
BUG: don't try to deal with a dead cache refereant (GH5216)
Merge pull request #5217 from jreback/cacher

BUG: don't try to deal with a dead cache referant (GH5216)
DOC: add DataFrame et al class docstring to api docs

+ add template class.rst (copied from numpy)
+ adapt sphinxext numpydoc (was outdated, attributes not included)
Merge pull request #5160 from jorisvandenbossche/api-docs-template

DOC: add DataFrame et al class docstring to api docs
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
Updated Documentation for Google BigQuery Module, and Added to_gbq to frame.py
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.