basic implementation of ICE failure notifications in chat window
added missing tests for NotificationView
added link to ice candidate state specification
Merge with master
Merge pull request #281 from n1k0/failed-ice-connection-notification

ICE failure notifications in chat window
Server: move the SESSION_SECRET to env vars

This does not fix the fact that the session secret is actually secret at
deployment. For now, in production it will use the session secret available in
.awsbox.json.
Address pull request comments
Merge pull request #294 from tOkeshu/fix-session-secret

Move the SESSION_SECRET to env vars
Remove SESSION_SECRET from .awsbox.json
Makefile: Fix the cover_server target
Merge pull request #295 from tOkeshu/fix-session-secret-take-2

Remove SESSION_SECRET from .awsbox.json
Make call hangup work again by making sure we store the callid when receiving a call
Extend functional tests to check the chat window has been closed
Rename CollectedContacts to ContactsDB
Fix review comments
Merge pull request #296 from Standard8/call_hangup_fix

Fix call hangup
Send call id for call upgrades, so that they hangup the call properly
Fix comment about contacts db
Merge pull request #297 from Standard8/collected_rename

Rename CollectedContacts to ContactsDB
Store imported google contacts in the contacts db