sunpy/eitwave — pull request #31 by ayshih (2013-04-12 18:01:12+00:00)
Title: Transformations, added HG' to HPC and other cleanup

`util` was missing a transformation from HG' to HPC, which would be useful to visualize detection results in helioprojective space

I also got rid of redundant code by having the straight transformations be special cases of the transformations that include rotating to/from the wave epicenter

Merging immediately so that Andy can use it