Did someone call my name?

Improvements

• Mentions in text cards: type @ to tag others in a space and send them a notification
• View notifications in space inboxes (hint: take a look at the bottom right hand corner of any space)
• Open/close the inbox with ⌘ + e
• Press "e" to mark a notification as done
• Arrow keys allow you to navigate through notifications
• Full screen browse now opens/closes faster
• New tabs open faster

Bug Fixes

• Fixed issue where deleting cards caused spaces to be bolded in the sidebar