Fixed bad quiver transforms.
Fixed failing test on travis.
Don't free a font that hasn't been created
Don't clear glyphs if the face was never created.
Don't snap pcolor
Attempt at updating the pickle image test.
DOC : improved `extent` of `imshow` doc

closes #990
slight edits to docs as suggested by @mdboom
TST : test `plot(.., color='none')`

added failing test for issue #2760
BUG : make `plot(..., color='none')` work again

Fixes #2760

Fixes miss-handling of color conversion logic introduced in edc48f0
Merge pull request #2761 from tacaswell/fix_line_color_handling

Fix line color handling
BUG : instantiate fall-back writer

fixes #2651

If the a string is passed into save as `writer` the code tries to
look up a writer with that name and create it.  If a writer with that
name is not in the registry, it is replaced with the name of the first
writer that _is_ in the registry, but not an instance of that type.
Make it possible to control snapping from the outside.
Merge pull request #2726 from mdboom/pcolorsnap

Don't snap pcolor
changed the text of INSTALL to be correct about what external
dependencies you need to install on windows.
TST : eventplot empty event list

test for eventplot not raising an exception
BUG : allows empty event lists to be passed in

fixes #2786
colors unsorted
Merge pull request #2787 from tacaswell/empty_event_loop

Empty eventplot.
Merge pull request #2774 from tacaswell/windows_installdoc_tweak

Changed the text of INSTALL to be correct about external dependencies for Windows.