jaxrs: add withPluginInfo support to /1.0/kb/accounts/.../paymentMethods

Signed-off-by: Pierre-Alexandre Meyer <pierre@ning.com>
pom.xml: auto version modules during releases

All submodules have the same versions for now.

Signed-off-by: Pierre-Alexandre Meyer <pierre@ning.com>
pom.xml: add nexus-staging-maven-plugin

After having done release:perform, one can now do

  mvn nexus-staging:release

to finish the release (instead of going through the UI).

See https://issues.sonatype.org/browse/OSSRH-5640.

Signed-off-by: Pierre-Alexandre Meyer <pierre@ning.com>