Trial implementation of __repr__ and __str__
Use component_names, make scalars work, different repr
Adapt better to scalars; write __getitem__ using self.components
Add str() in dtype to work around pre-unicode numpy/python2
Merge pull request #13 from mhvk/ape5-repr-str

Implementation of representations' __repr__ and __str__
removed remaining non-APE5 transform stuff
fixed aliases for buildin frames
add representation repr/str tests
Initial commit of SkyCoordinate high-level class
Use BaseCoordinateFrame not SphericalCoordinatesBase
Change SkyCoordinate to SkyCoord
Update to use frame_transform_graph
Change COORD to FRAME for globals names