This distinguishes them from tools like 'kafka-producer'
which are not required to run a dendrite server.
The prefix also groups together the dendrite binaries nicely
on `ls` as well as making it nicer to tab-complete.
* Add integration tests for roomserver to travis
* Try setting the dist trusty to see if that helps with postgres
* Pretty print the test input JSON
* Add comment as to why we are using trusty
