Simplifying followers mappings

Less complicated determination of subscription

Deduplicating some logic and switching to pluck, to avoid pulling the entire model in memory.

Fix Vagrantfile to include yarn

Using "rails style" order arguments

The current Vagrantfile fails to build upon provisioning, as it lacks yarn.

Change the Vagrantfile to add the yarn repository, and install yarn.

Show correct volume icons on video player

Show logout button on getting started so it's available on mobile

Emojify display names in notifcations

Improve contrast of bio and username text in account info

Add Vagrant support for easy development environments

h-feed, h-card and h-entry

Twitter Cards support

Upgrade EmojiOne to 2.2.7

for local attachments, use them in URLs. Check status privacy
before redirecting to actual file.

Adds support for, among other things, 

Prevent duplicate desktop notifications

Add tag property to desktop notifications, preventing duplicates (i.e. when multiple Mastodon tabs are open)