tweaks
Add transform function to GenericMap
attempt at cube rerot
Merge branch 'master' into diff_rot_image

Conflicts:
	sunpy/image/rescale.py
	sunpy/map/mapbase.py
Merge remote-tracking branch 'upstream/master' into diff_rot_image

Conflicts:
	sunpy/map/mapbase.py
	sunpy/map/mapcube.py
Merge branch 'diff_rot_image' of github.com:Cadair/sunpy into diff_rot_image

Conflicts:
	sunpy/map/mapbase.py
	sunpy/map/mapcube.py