Merge pull request #1862 from mdboom/docs/remove-doctest-skip-markers-from-output

Remove doctest-skip markers from output
Merge pull request #1861 from mdboom/wcs/add-list-of-projections

Add list of supported projections to WCS docs
Merge pull request #1854 from mdboom/wcs/fixing

Issues with WCS fixing
Merge pull request #1867 from mdboom/table/sort

Table sort fails for unicode fields in numpy 1.5
Refactor astropy.table to use six.
Fix Unicode issues when representing tables.
Add changelog entry
Fix for Python 3.x