BLD: erase local ipython_directive
BLD: pull in latest ipython_directive from ipython 0355d3d
BLD: ipython_directive, add back okexcept
BLD: ipython_directive, enforce tight layout for mpl plots
BLD: ipython_directive, cython magic fix
BLD: make io.rst utf8-safe GH5142 GH5926
BLD: ipython_directive, decode ipython output as utf8+replace
Merge pull request #5925 from y-p/PR_rebase_ipython_directive

Rebase ipython_directive on top of recent ipython updated version
DOC: document read_csv fastpath for iso8601 datetime strings
Merge pull request #5993 from y-p/PR_doc_iso8601_fast_path

DOC: document read_csv fastpath for iso8601 datetime strings
DOC: Document fast path in to_datetime GH4826
DOC: typos
ENH: Add array_equivalent, to address the handling of NaNs when comparing arrays for equality.
Added equals method for Series and DataFrames