baby step towards enabling profile edits

adds
* url and bio fields to database
* form for editing the user profile
* route to the edit profile controller
* view for the profile editing page
* template for the profile editing page
* link to edit profile in the welcome page

still needs
* thorough inspection to see if it makes sense
* tests
* ?

mediagoblin/db/models.py

@@ -46,7 +46,7 @@ class User(Document):
         'status': unicode,
         'verification_key': unicode,
         'is_admin': bool,
-        'website_url' : unicode,
+        'url' : unicode,
         'bio' : unicode
         }