Update account management system

[jonathanstegall]

We need to do these things:

Account Settings

• Show multiple email addresses if user has them
• Add/delete email addresses to user record
• Mark email address as primary
• Link each email address to page where user can manage MailChimp settings
• Ideally, find some way to resubscribe users who have unsubscribed via API.

Donations

• If user has recurring donation and its status is Open, show it. "Your donation is $10 monthly, and the next donation date is 2/4. Edit (send to current update page in the Stripe app) | Cancel (send to new cancel page in the Stripe app)
• List all Pledged opportunities with their CloseDate value. Edit (send to current update page in the Stripe app) | Cancel (send to new cancel page in the Stripe app)
• If user has never made a donation, give them a link to the donate page
• If user has ever made a donation, show them a link to Your Donation History

Your Donation History

• List all Failed opportunities (only those with Failed as their StageName value) by CloseDate. Edit (send to new page in the Stripe app)
• List all Closed Won opportunities by CloseDate

Stripe app changes

• Move recurring donation to Cancelled (Open-Ended Status field)
• Move opportunity to Closed Lost (StageName field)
• Resubmit failed opportunity. Change StageName to Pledged and update its CloseDate (this will send a receipt to the user when it processes, as normal)

Salesforce

• Send email to user when they cancel a donation
• Send email to user when a donation fails

[jonathanstegall]

The item "Link each email address to page where user can manage MailChimp settings" is fixed in this PR: MinnPost/minnpost-largo#12.

[jonathanstegall]

The resubscribe item is fixed in MinnPost/minnpost-form-processor-mailchimp#1.