DOC: fix docstring of value_counts/nunique dropna argument after GH7424
DOC: Fix parameter in reindex_axis docstring
TST/CLN: Refactor io.data.options class to improve testing

Removed most references to month and year (passing expiry date around instead).
Also protected with RemoteDataError checking for the expiry month links.
BUG/CLN: LinePlot uses incorrect xlim when secondary_y=True
DOC: squash gh6838. Separate set_options from basics.rst
DOC: better format of option descriptions

- remove extra spaces from option descriptions (already in strings in config_init.py)
- move default and current value to last line
Merge pull request #7566 from kyleam/reindex_axis-docstring

DOC: Fix parameter in reindex_axis docstring
PERF: improve resample perf
DOC: fix docstring for DataFrame.interpolate
Merge pull request #7553 from jdreaver/master

DOC: fix docstring for DataFrame.interpolate
BUG: Test for underlying price before reducing data

Removed most references to month and year (passing expiry date around instead).
Also protected with RemoteDataError checking for the expiry month links.
Merge pull request #7578 from clham/6838_set_option_doc

DOC: closes gh6838. Breakout options.rst from basics.rst
Merge pull request #7674 from jorisvandenbossche/doc-options-docstringwidth

DOC: remove extra spaces from option descriptions
BUG: grouped hist raises error with single group
Merge pull request #7665 from dstephens99/master

TST/CLN: Refactor io.data.options class to improve testing
Merge pull request #7673 from sinhrks/minmax_perf

PERF: improve resample perf
TST/COMPAT: numpy master compat with timedelta type coercion
FIX: to_sql takes the boolean column as text column
Merge pull request #7681 from jreback/numpy_issue

TST/COMPAT: numpy master compat with timedelta type coercion
TST: skip buggy test on numpy < 1.7, 3.2, on 32-bits (GH6270)