Adds approvment for user Master request; sends emails; adds core notifications.
Hides "Master" checkbox for admins.
CSS corrections
create Tag model; inherit Genre from Tag; add footer
changes email credentials; CSS corrections
add Players page
CSS corrections
games; genres statistics

Game:
- CRUD for games
- CRUD ability checks for master/player
- Email notifications for creating/joining/leaving game
- Subscribing for games

Genre:
- Proper statistic
- Modified ability check (now only admin can CRUD genres)

Css stuff
fixes typo
uses sidekiq to send email in background.
another try to boot sidekiq
fixes element jumping on low density screens
fits masters page columns
adds comments to game
fixes tokeninput broken CSS
russian text for tokeninput
adds white-space style to descriptions
roots to Games tab
makes tags for profile and game more generic
adds tags to game description page