fix error introduced in adding quantities in draw_limb
fixes the apparent right ascension in sun.py.
remove the incorrect array indexing
Merge pull request #737 from wafels/fix_app_ra

Fixed for the apparent right ascension
Merge pull request #735 from ehsteve/bugfix

Fix error introduced in adding quantities in draw_limb
Merge remote-tracking branch 'origin/master' into documentation_sprint

Conflicts:
	sunpy/map/mapbase.py