Add subscription and pwyc selection into start new group process 

This is ready to go and can be QA'd on staging @s01us

This feature routes the flow of starting a group (logged in and logged out) through the payment model selection pages.
Once the appropriate model is chosen an invitation is sent, the user clicks the invite and is asked to sign up (If you already have an account with that email you will need to click to sign in).
When the admin is signed in they should land on the group setup page. Once this is submitted they should land on the group page.  If the user quits for some reason before finishing this step. The next time the visit the group they should be directed to the setup to complete it.

The group-request admin panel has been simplified and the status of a group_request is now not used.
The group request remains in use for two reasons. One for existing data and to to generate and store the tokens for the groups invites.  A future refactor should remove the next to continue to use the group_request model.

#### IE TESTING ####
- No place-holders in IE7, IE8 and IE9
- No video on homepage in IE8