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Rejoin session on Socket.IO reconnect event
Merge branch 'customization' into integration
Refactor app startup and authentication handling

This fixes extremly slow and bugged QR login.
Merge branch 'customization' into integration

Conflicts:
	src/main/webapp/app/controller/Auth.js
Disable routing after app startup, fix app#checkPreviousLogin
Merge branch 'customization' into integration

Conflicts:
	src/main/webapp/app/controller/Auth.js
Correcly join session via SIO later when connection has not been
established
Merge branch 'customization' into integration
Fix feedback average calculation
Use WebSocket support detection, SIO related code cleanup
Merge branch 'customization' into integration

Conflicts:
	src/main/webapp/app/proxy/RestProxy.js