(Add) notification handler & template & css (wip)
(WIP) Init letter select + move
(Add) Notifications system
(WIP) letters dispatch on game start
(UP) gameStart handling implemented
(UP) refactor letter dispatch
(WIP) handle mixmo actio nduring game
Merge remote-tracking branch 'origin/playground' into notif-merge-playground

Conflicts:
	client/client.js
	client/stylesheets/mixmo.css
	client/views/mixmo.html
	lib/comon.js
	server/mixmo.js
Merge remote-tracking branch 'origin/playground' into notif-merge-playground

Conflicts:
	client/client.js
	client/room/room.html
	client/views/mixmo.html
	server/mixmo.js
Fix merge conflict
(UP) css & template
(UP) Better Mixmo! handling after game start
(UP) call notification when Mixmo
(UP) fix toUpperCase function call
(WIP) player gridletters
(UP) two-way communication between currentletters and gridletters
(FIX) player grid is now reactive