remove active from reminders form
add new reminders list view
redirect successful processing of reminders form to reminders list view
differentiate between edit and create in reminders form
cancel button goes to new reminders list view in reminders form
add previewer options to MessagesTab sidebar for reminders and gateways
restrict navigation changes in messaging tab to ryan, sheel, and biyeun
Merge pull request #1538 from dimagi/more-reminders

New Reminders List UI and adding Reminders+Gateway changes to Messaging sidebar