Added /roster room unread preference

closes ##708

themes/boothj5

@@ -111,6 +111,7 @@ roster.presence.indent=-1
 roster.status=true
 roster.rooms=true
 roster.rooms.order=name
+roster.rooms.unread=after
 occupants=true
 occupants.size=15
 occupants.jid=false

themes/complex

@@ -39,6 +39,7 @@ roster.presence.indent=1
 roster.status=true
 roster.rooms=true
 roster.rooms.order=unread
+roster.rooms.unread=after
 privileges=true
 presence=true
 intype=true

themes/simple

@@ -31,6 +31,7 @@ roster.resource=false
 roster.presence=false
 roster.status=false
 roster.rooms=false
+roster.rooms.unread=off
 privileges=false
 presence=false
 intype=false