Modify Message class for easier use

* Constructor takes options hash now
* :to and :chat are attr_accessible
* Replace #pretty with a good #inspect
update all uses of Message.new
default from_name as from
take advantage of optional from_name
replace Plugin#pretty with #inspect
add Mail#inspect, fix bug in log-broadcasting
use to_s, not inspect
fix bug in chatname setting
update to_s on Message/Plugin