The server can now start the game. The only condition, right now, is
that all robots have their player.
Server starts a webserver for each robot at start time. (only supports 1
robot for now)
Merge pull request #66 from dchilot/feature/admin_client_2

Feature/admin client 2
wip : start one webserver per robot, pass their url in input
Merge remote-tracking branch 'central/master' into feature/start_videowebserver
read port range from config file + read videoUrl
WIP intermediate commit, videoport retransmission
Server can start and kill the videofeed webservers.
server web and messages up to date
add missing info in welcome message (ip port)
Merge with feature/start_videowebserver