Update coordinates index.rst
Update coordinates transforming.rst
Initial cut at Using SkyCoord docs
Allow SkyCoord input as a numpy array
Mostly finished skycoord initialization docs
Add reference to angle creation section
Allow SkyCoord input as a numpy array
Finish up SkyCoord related updates
PEP8 fixes
Update SkyCoord docstring
Fix typo in SkyCoord docstring
Docstring suggestions from @eteq
Remove AltAz as a coordinate frame in SkyCoord docstring
More examples and clarification per @eteq comments
Add wording to be more inclusive of non-spherical representations
Add point regarding SkyCoord allowing only frame_transform_graph frames
Merge pull request #2552 from taldcroft/coordinates-docs

Add sky coordinates documentation