combine private and public messaging controllers
simplify number of members and bugfix

- simplify number of members display similar to what I did earlier in
the broadcast controller
- fix bug from merging public and private controllers (right when I
thought I got it right on the first try)
add list of online members

list of both all online members and members in room visible for now (to
be combined)
combine displayed user lists
Merge pull request #7 from reebalazs/improve_messaging

Improve messaging