Updated description
Minor fixes to docs
Added m.mm and s.ss to the tick label format docs
Auto-set coord_meta for string frame types
Put API on separate page
Added section on overlaying coordinate systems
Fix compatibility with Astropy 0.3
Updated supported frames
Added example for contour overlay and ax.scatter
Added custom frames to index
Import CoordinatesMap into __init__ to include it in the API docs
Merge pull request #76 from astrofrog/tidying-up

Various fixes ahead of release