Add filters to notifications controller
Port aspect membership dropdown and hovercards
Port notifications to Bootstrap
Merge pull request #4814 from svbergerem/notifications-bootstrap-port

[WIP] Port notifications to Bootstrap and add filters, port hovercards
Add separator between days, don't display grey zero
Merge pull request #4867 from svbergerem/polish-notifications-view

Add separator between days, don't display grey zero
Hovercards! Everywhere!
Merge pull request #4870 from svbergerem/activate-hovercards

Activate hovercards in SPV and conversations