changed term prenumeration to subscription in OSC implementation
Removed unnecessary exception throwing for absent template-hosts element in config file.
Fixed problem in audio_mixer where a default constructed channel_layout was used. Also fixed so that default constructed channel_layout and mix_config instances doesn't have uninitialized members
Merge branch 'master' of https://github.com/CasparCG/Server
Statically link against SFML instead of dynamically

#117