sunpy/sunpy: v0.9.1

Dear all,

We have a new bugfix. We strongly recommend upgrading as several important bugs have been addressed.

• MapCube has been renamed to MapSequence. MapCube does not actually work on cubes but a sequence of maps. Due to this change, MapCube is now deprecated but will not be removed until SunPy 1.0. (#2603 <https://github.com/sunpy/sunpy/pull/2603>__)

• parse_time now parses numpy.datetime64 correctly (#2572 <https://github.com/sunpy/sunpy/pull/2572>__)
• Fix the bug that prevented VSO queries for HMI data from downloading file without speicifying a.Physobs. (#2621 <https://github.com/sunpy/sunpy/pull/2621>__)
• Fix sunpy.map.mapcube.MapCube.plot. The code had not been updated to support the changes to the wcsaxes helper functions. (#2627 <https://github.com/sunpy/sunpy/pull/2627>__)
• Replace all use of the deprecated sunpy.cm.get_cmap with plt.get_cmap to prevent deprecation warnings being raised. (#2635 <https://github.com/sunpy/sunpy/pull/2635>__)
• Fix generation of the coordinate transformation graph with Astropy 3.1.dev (#2636 <https://github.com/sunpy/sunpy/pull/2636>__)
• Prevent helioviewer from erroring when downloading file to a directory that does not exist. It will now create the directory when required. (#2642 <https://github.com/sunpy/sunpy/pull/2642>__)
• Fix transformations into/out of Heliographic Stonyhurst frame when the coordinate representation is Cartesian. (#2646 <https://github.com/sunpy/sunpy/pull/2646>__)
• Support passing Python file objects to sunpy.io.fits.write. (#2688 <https://github.com/sunpy/sunpy/pull/2688>__)
• Added DRMS to setup.py so sunpy[all] installs it as a dependancy. (#2693 <https://github.com/sunpy/sunpy/pull/2693>__)
• Fix eve 0cs timeseries seperator regex to support Python 3.7 (#2697 <https://github.com/sunpy/sunpy/pull/2697>__)

• Organise the gallery into sections based on example type and tidy up a little. (#2624 <https://github.com/sunpy/sunpy/pull/2624>__)
• Added gallery example showing the conversion of Helioprojective Coordinates to Altitude/Azimuth Coordinates to and back. (#2656 <https://github.com/sunpy/sunpy/pull/2656>__)

• Revert the handling of quantity_allclose now that astropy/astropy#7252 <https://github.com/astropy/astropy/pull/7252> is merged. This also bumps the minimum astropy 3 version to 3.0.2. (#2598 <https://github.com/sunpy/sunpy/pull/2598>). We still support Astropy 2.
• Sort the ana C source files before building to enable reproducible builds. (#2637 <https://github.com/sunpy/sunpy/pull/2637>__)
• We are now using towncrier <https://github.com/hawkowl/towncrier> to generate our changelogs. (#2644 <https://github.com/sunpy/sunpy/pull/2644>)
• Use of textwrap to keep source code indented when multiline texts is used (#2671 <https://github.com/sunpy/sunpy/pull/2671>__)