api 1.16: Add plugin configuration to maven-release-plugin

api 1.16: Add plugin configuration to maven-release-plugin

This is done to override the parent pom's behavior. We made a similar change
while releasing 1.15.0-rc: https://codereview.appspot.com/9281044/
However, that did not solve the problem acknowledged by the following bug
report: https://issues.sonatype.org/browse/CENTRALSRV-35
The previous change was only for specifying the correct profile. In order to be
able to pass the GPG passphrase over the command line *and* set the profile, we
need to ensure the arguments are being passed through and not ignored.

[peleyal, 2013-07-23 20:38:10]

LGTM