DOC: some stylistic improvements to docstring rendering in documentation
DOC: correction of example in unstack docstring
Merge pull request #4602 from cancan101/number_parsing

Fixes issue with TextFileReader using python engine and thousands != ","
BUG: bug in getitem with a duplicate index when using where (GH4879)
Merge pull request #4881 from jreback/boolean_dup

BUG: bug in getitem with a duplicate index when using where (GH4879)
CLN: move README.rst to markdown
Merge pull request #4888 from cpcloud/readme-fixup

CLN: move README.rst to markdown
BUG: off-by-one when doing network test repeats

Imagine num_runs is two, then runs will take on the values [0, 1] and runs <
num_uns will always be False. Hence any genuine Exception the code might raise
will be silently ignored and just printed.
BUG/TST: fix (and skip) tests that have been failing unnoticed all along

The test is unstable and although this makes it work properly, no one knows how
long. Hence it was decided to skip this guy until further notice.

See also: #4427

Skip test_fred_nan and test_fred_parts, both of which have been failing silently for a while
Merge pull request #4485 'PR_fix_of-by-one-in-network-repeats'

Also added two skip tests for other fred tests in addition to @esc's
work.
BUG/TST: Fix failing FRED comparison tests and remove skips.
Merge pull request #4891 from TomAugspurger/fixfred3

BUG/TST: Fix failing FRED comparison tests and remove skips.
ENH: Series.str.extract returns regex matches more conveniently
Merge pull request #4696 from danielballan/str_extract

ENH: Series.str.extract returns regex matches more conveniently
CI: allow print_versions to work without pandas install
DOC: warning about using numexpr > 2.1 as it has a backward incompatible change
     that affects PyTables < 3.0
BUG: Constrain date parsing from strings a little bit more #4601

Currently dateutil will parse almost any string into a datetime.  This
change adds a filter in front of dateutil that will prevent it from
parsing certain strings that don't look like datetimes:

1) Strings that parse to float values that are less than 1000
2) Certain special one character strings (this was already in there,
   this just moves that code)

Additionally, this filters out datetimes that are out of range for the
datetime64[ns] type.  Currently any out-of-range datetimes will just
overflow and be mapped to some random time within the bounds of
datetime64[ns].
Merge pull request #4776 from jorisvandenbossche/doc-unstack

DOC: correction of example in unstack docstring
Merge pull request #4901 from cpcloud/print-versions-without-pandas

CI: allow print_versions to work without pandas install
Merge pull request #4775 from jorisvandenbossche/docstring-rendering

DOC: some stylistic improvements to docstring rendering in documentation