Update registration resource, forms, and api tests for first and last name fields

[rabialam]

Currently, there is no way to submit first and last names as fields for user creation, nor any way to retrieve these profile fields for a given user.

[rabialam]

Currently, the user profile resource is not implemented correctly -- it uses a subset of fields off of User query set when it should really use the UserProfile query set. However, right now, a corresponding UserProfile object is not created when the User object is created through interaction with the registration endpoint.

[rabialam]

User profile resource now implemented to use UserProfile query set. Email signup form modified to create UserProfile after creating new user. API tests updated to reflect changes.

[rabialam]

To use this new resource:

• Be authenticated.
• Make a call to userprofile endpoint of API.
• In response, you'll have first_name and last_name field
• ???
• PROFIT

Example call (from my unit test): (note that here, self.uri = '/api/v1/userprofile/')

        auth_header = 'Basic %s' % base64.b64encode('%s:%s' %
                (user_profile.user.email, self.password))
        resp = self.client.get(self.uri, data=self.auth_params,
                HTTP_AUTHORIZATION=auth_header)

Then, we get this in resp.content:

{'meta': {'limit': 20,
          'next': None,
          'offset': 0,
          'previous': None,
          'total_count': 1},
 'objects': [{'first_name': '1',
              'last_name': '1',
              'resource_uri': '/api/v1/userprofile/1/'}]}