payment: changes to support refunds searches

Bump to 0.8.0-SNAPSHOT due to the backward incompatible changes.

Signed-off-by: Pierre-Alexandre Meyer <pierre@mouraf.org>
util: add search APIs for Tags and CustomFields

Signed-off-by: Pierre-Alexandre Meyer <pierre@mouraf.org>
Merge branch 'master' of github.com:killbill/killbill-api

Signed-off-by: Pierre-Alexandre Meyer <pierre@mouraf.org>

Conflicts:
	NEWS
	pom.xml
pom.xml: updates for release 0.8.0

Update killbill-oss-parent to 0.5.17

Signed-off-by: Pierre-Alexandre Meyer <pierre@mouraf.org>