Use private fork of matplotlib with fixes to plot_directive
Make use of new :context: reset
Added six to requirements
Use a standalone version of plot_directive
Don't set font for docs
Use setuptools if available
Add missing loop
Allow reseting wcs object
Merge pull request #21 from ChrisBeaumont/master

Small tweaks and bugfixes
Re-implement set_[xy]label
WCSAxesSubplot class.
Merge pull request #23 from ChrisBeaumont/axis_label

Re-implement set_[xy]label
Merge pull request #22 from ChrisBeaumont/tight_axes

WCSAxesSubplot
Modified constructor of WCSAxes class to allow overriding transData

- useful for doing flexible things with the rendering
Merge pull request #13 from ejeschke/pass-transdata

Modified constructor of WCSAxes class to allow overriding transData
Refactor transformation classes to better support slicing of WCS
Generalize find_coordinate_range to arbitrary number of coordinates
Generalize CoordinatesMap to arbitrary number of coordinates, with slicing
Transformation default is now pixel to world since it is always defined
Add slicing and arbitrary number of coordinates to top-level WCSAxes class