added ability to mute outgoing and/or incoming audio
sync with master
minor refactored bits of server/users module towards a more functional style
Merge pull request #209 from n1k0/minor-server-users-improvements

Minor changes to server users module
Merge pull request #200 from n1k0/incoming-outgoing-audio-mute

Ability to mute outgoing and/or incoming audio
sync with master