Rename host to url for clarity.

Rename config.api.host -> url. Rename process.env.API_HOST -> API_URL.
Cleanup utils/request.js while at it.
Remove handlers for ticket-events.

Remove ticket-event handlers, because the new teamboard-client does
not use any socket.emit functionality apart from board:join and :leave.
Remove methods other than GET from socket.request.
Rename API_HOST to API_URL
Merge branch 'master' of https://github.com/N4SJAMK/teamboard-io into dev
Make startup actually say something
Update README.md
Add redis dumps to gitignore
Merge branch 'dev' of https://github.com/N4SJAMK/teamboard-io into dev
Merge branch 'dev'