add serverId
allow changing of serverId
simplify and cleanup

- condense var declarations
- organize authService better
- delete old, unused code
- remove unnecessary $apply
rename ploneUserid -> userId

symmetric with serverId
identify user by serverId:userId in firebase
fix portraits bug

portraits would not always become visible
show serverId in tooltip
fix bug

used "username" variable multiple times, rendering a condition
ineffective
show entire username in tooltip
Merge pull request #23 from reebalazs/server_support

Server support