pass in flow_id to relation settings
some special casing for local dev
error writing should not be in if, sorry
flow instance should also report full error
verion for source from buffer
Merge pull request #24 from zillabyte/xiao/master

@jakequist, @nkarnik -- fix local dev mode sinking
Merge pull request #23 from zillabyte/jake/master

@sjarvie -- add multilang clumper
Merge pull request #25 from zillabyte/xiao/version

@jakequist, @sashikanth, @nkarnik -- allow sourcing from different versions of a relation
fix test