Add New GF to Register/Complete Details for Friends

[jimtrue]

Add to 'Thank You' page for Donating.

• Include pipeline to MailChimp for new Friends of Pods
• Creates the Populated Friends record linked to the User Account of the recently purchased 'donation'.
• Needs to Pass 'Level' to Thank you page so the form can be completed (and filtered) based on the Level selected.
• Fields to Add: Show on Front Page
• First/Name & Display Name are User Profile Fields
• Company Name, Show Company name instead of Personal Name?
• Twitter Handle
• Slack User name on PodsWP.slack.com (be sure to join our slack so you can have access to the special Friends channel
• Website, Which would you prefer to link [Website, Twitter or Both]

[jimtrue]

Related to #8