[REL] Matplotlib 2.2.2

Folks,

Happy to announce Matplotlib 2.2.2, the second bug-fix release of the v2.2
LTS series.

This release fixes a number of critical bugs from 2.2.0:

- restores matplotlib.verbose (fixing embedding in pycharm)
- preserve precision when color mapping small portions of data with
   extreme outliers
- fixes saving long movies with ffmpeg
- fixes UnbourdLocal error in contour labeling
- fixes import failure on python 3.4.0 and 3.4.1
- fixes compile time failures with clang on 32bit platforms
- fixes an icon in the Tk backends
- fixes several issues with Tables
- fixes expanding offset boxes with tight_layout
- revert changes to the font caching to avoid a possible bug in
   backports.lru_cache
- numerous docstring and documentation fixes

We have reverted the deprecation of `font_manager.TempCache`.

Thank you to everyone who submitted bug reports and worked on this!

v2.2.1 is tagged, but we do not plan to release / publish to pypi.

Tom
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