Redirect back to profile edit on service

When logging into a service like MyUSA or LinkedIn,
redirect back to the profile edit page (which is likely
where you started)
Keyup on bio change

When the bio changes, enable the save buttons.
Add username verification

Usernames should be unique, so perform client-side
validation that the username is unique.

Adds a helper function to the UserController to check
usernames.
Update popovers to show title/agency/location

Popovers now use the information entered in a profile
to show the user's title, location, and agency.

Modified UserController's info method to pull out
the agency and location tags if they're specified,
to make it easier on the front end.