add information in the envelope about who the convener is

[dadahl]

so that everyone knows who the convener is?

[dadahl]

maybe something like:

"conversation": { 
           "id": "jk31050879662407560061859425913208",
           "current_convener": speaker_uri,
           "conversants" :[ ...

This implies that there is only one convener at a time, but that the convener can change within a conversation.