Release 0.5.3

Mock out glymur for doc build.

Mock glymur if glymur or a backend is not installed.

Change version number to 0.5.1.

Release 0.5.1

remove redundant exception docs from database.rst

This works-around a werid doc bug. see astropy/astropy-helpers#37

Fix docstring in map.rotate()

Version 0.4.1

Merge pull request sunpy#838 from Cadair/0.4

This is 0.4

bump version numbers

Merge pull request sunpy#575 from Cadair/0.3

bump version numbers

Merge pull request sunpy#565 from sunpy/master

balls