[NEW] [WIP] #4466 Port settings pages to Bootstrap (edit profile, edit account, privacy, services)

Hey guys!

First of all, sorry for creating a new PR and making you do code review twice. My bad.

First attempt was a bit clumsy and I was really out of time, too busy at work to do things the tidy way. Now I have more time, and I'm happy with the results of this one, really clean.

I ported all of the changes from the old PR to this new one, manually, taking all of your comments / observations into account. 

Let's see what Travis says and review.

I'll comment the old one so you can freely delete it.