[bugfix] fixed deadlock when marking face invalid
[bugfix] fixed loading of chat messages when user if offline
[bugfix] mark face as invalid on any exception received from NDN-CPP
v0.3.2

- updated core data model version for managing cascade deletion for
chat rooms
- fixed minor bugs
- incorporated bundled audio
'dev'->'master'
NdnCon v0.3.2

bundled audio version.
it’s not compatible with previous version of NdnCon