also install the default datomic-free database
use the latest datomic version
install-g dbin in parallel with the (optional-to-become) datomic-free upgrade / use of the latest default version
travis was giving a warning about deprecated datomic-free@0.1.1 -- not sure if coming from here
dbin is already using datomic-free, and the upgrade / use could be improved before giving examples
examples align better with $ dbin #in-front
Merge branch 'active'