Run unit tests as a separate Travis task.
Run unit tests as a separate Travis task.

grimmerm/sulong,grimmerm/sulong,grimmerm/sulong,crbb/sulong,lxp/sulong,crbb/sulong,lxp/sulong,grimmerm/sulong,PrinzKatharina/sulong,lxp/sulong,PrinzKatharina/sulong,lxp/sulong,crbb/sulong,crbb/sulong,PrinzKatharina/sulong,PrinzKatharina/sulong