Fixed endless creation of new server threads.
Merge branch 'server'
Fixed errors by missing ARecruit->where; PlayerIds

There were some errors ARecruit->where, that was
not sent on client side but used on server side -> fail.

Added Player->getPlayerIdStr() returning the Player ID
as a string.

Fixed missing registration of ARecruit in network/
Merge branch 'server' into network

Conflicts:
	network/CMakeLists.txt
Merge branch 'server' into gamemodel
Merge branch 'server'
Merge branch 'client'
Update .travis.yml
Added dependencies installation in CI
Added more deps for CI
Updated dependencies; CMakeLists.txt for linux
Temp: In CI: Show all installed boost packages
Updated boost version for CI
CI: Silent installation of deps
Merged CI and CMake config from master
Merged CI and CMake config from master
Added CI status image
Added CI status image

[ci skip]
Merge branch 'master' of https://github.com/msiemens/UH-INF-StrategicGame
Fixed CI Status Image URL