Created a randomtimer

It counts down from a random interval specified in the paramaters
(lower and upper limit is specified)
Changed module export
Included the random timer in the html files
Added randomTimer to server
Moved timer from serverGame to socketHandler
Powerups are now placed after a random interval

They aren’t removed yet, so multiple power ups are available after a
while
Fixed small error
Merge branch 'randomTimer' into development

Conflicts:
	Paaltjesvoetbal/server/lib/SocketHandler.js

Fixed conflicts and some weird error that the conflict caused (it
removed the new way in which newPlayer is called)