spawning server via gui, terminating it at the end
removing dead code
travis fixes
do not commit google test fix
server port updates
add pid logger for the server (but not working properly)
add switch windows/linux for server name
Merge pull request #32 from Neki/topic/hv_world_test

Add tests to class World.
don't start server if old server pid is still used
remove unnecessary dependency
Merge branch 'master' of https://github.com/Neki/bomberman into topic/st_spawnserver
merge fix
Modify default speed_ value.
Add test for class Character.
Merge pull request #29 from Neki/topic/st_spawnserver

spawning server via gui, terminating it at the end
Fix the event type taking 4 bytes (instead of one) on the network.

It is also the occasion for a little refactoring.
Fix event timestamp being 64 bits (instead of 32).
Fix server not actually broadcasting world state.
Fix confusion between Entities and Characters.
Fix segmentation fault when an entity could not be deserialized.