pom.xml: updates for release 0.7.27
pom.xml: updates for release 0.7.27

Update killbill-commons to 0.2.24
Update killbill-api to 0.9.10

Signed-off-by: stephane brossier <c1fb28815da1df8a6921017a648d6c4b5d859b78@groupon.com>

rocketlawyer/killbill-oss-parent,aeq/killbill-oss-parent,killbill/killbill-oss-parent,kares/killbill-oss-parent,andrenpaes/killbill-oss-parent,maguero/killbill-oss-parent