pom.xml: updates for release 0.16
pom.xml: updates for release 0.16

Add new CANCELED PaymentPluginStatus (used to return info about a payment that was not even submitted)

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

maguero/killbill-api,maguero/killbill-api,killbill/killbill-api,killbill/killbill-api