implement general notification functions
stringify method sends error message
fix typo
fix unexisting connection
factorise notification
remove debugger statement
factor route and matchmaking
factor lobby2game and helpers
remove connection reference in helpers
remove newlines
merge with master
remerge sam
Merge branch 'temp' into notify-client
Merge branch 'master' into notify-client

Conflicts:
	src/GameUpdater.js
fix typo
handle players leaving the lobby
Merge branch 'master' into notify-client

Conflicts:
	src/GameUpdater.js
Merge pull request #20 from dgellow/notify-client

Refactor client notifications