update README links
update README links

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