Integration of astropy.units in sunpy codebase

Attempt to integrate the astropy.units into sunpy. Every function that were taking or giving a quantity now must have astropy quantity associated with them. Please tell me if I have made mistakes anywhere, or if it could be done in better way, I will make changes! 
Thank you!   
Also, I think it's not **ascenscion** but ascen**s**ion, or at least that's how is in [wikipedia](http://en.wikipedia.org/wiki/Right_ascension)