removed resent log message

Ignore-this: fb20d98fced078f65b4c546ed415ef9b

darcs-hash:20140311124547-c21fe-f74477af8d8837dd7ea6e32469207f1dff2f3aec
renamed sessin to conversation

Ignore-this: a4e1a12fc81584b7bd95125a1ce0af2a

After some usability testing the concept of "session" was difficult to grasp.
Using the term "conversation" seems to be easier to understand.

This change is NOT backwards compatible as the protocol changed. Doing things like
this early before having many users is a good idea. :-)

darcs-hash:20140312224200-c21fe-8521f8a7169238499d3f85466305746d2b0e95cb
fixed bug where events were not shown in session

Ignore-this: 310be07257fb4d4d3373f64336742c27

local events are not encrypted. note, need concept on local message
instead of remote to make sure messages from outside to not cause events!

darcs-hash:20140312225222-c21fe-83cc9c112f36753844705f5a444a3e7dee053df8
added more security by expecting messages to be remote or local

Ignore-this: f05ecef8412c91b14d72c7f98ec9a664

Because events may go through the same mailboxes as other messages, it is wise
to determine if a message came from within the system or outside of it from the outside.

Each message handler can expect either a remote or local message and expect a certain
type of encryption if it is remote.

darcs-hash:20140313024008-c21fe-0e3442a0621d534736657fc5df7a3a97a245ea8a