one profile partial, fixes #116

I created
shared/profile_formfields 
wich is now rendered in the devise/registration/new and profiles/edit views

Why only formfields?
Because there are quite a few differences between the two forms (url paths and other local variables).

The idea of creating two form partials that render the same formfields partial wasn't possible, because rails complaint about 'stacking too deep'.

Also, styling :)