Added Travis CI badge to README
Added Travis CI badge to README

andrewdmcleod/jujubigdata,tsakas/jujubigdata,johnsca/jujubigdata,juju-solutions/jujubigdata,ktsakalozos/jujubigdata,tsakas/jujubigdata,andrewdmcleod/jujubigdata,ktsakalozos/jujubigdata-dev,ktsakalozos/jujubigdata-dev,johnsca/jujubigdata,ktsakalozos/jujubigdata,juju-solutions/jujubigdata