Merge pull request #160 from luisfmelo/bump-protobuf-dependency

bump github.com/golang/protobuf dependency v1.4.2 -> v1.5.2

update go.sum

Update README.md

add -p/--partition flag to produce command

consume: format key correctly; avoid truncating in case of non-json v…

…alue

Fix #113

add docker-compose for kafka setup (debugging)

config: add add-eventhub command

group/commit: return error if offset determined from timestamp is -1

fix issue where follow tries to consume from invalid offsets (-1)

return error if wrong proto type was given or loading was not possible