cleaned up visualization directory
added written_messaging package. Doesn't include any nodes, just defines the message.
added external messenger GUI for interacting as Phil or Sam
deleted interpersonal_communication
setting up slu node to handle speaker and listener info, work with written messages
set up slu node to handle speaker and intended listener based on the incoming message
central agent publishes written messages to the user's contacts
changed the external messaging GUI to deal with full names, Michelle not Sam
added phil/michelle GUI to launch, fixed central agent's manifest
Merge branch 'master' of https://github.com/davidogbodfog/scheduling_assistant