Fixed groupId and bumped development version.
Fixed groupId and bumped development version.

The Hudson update center is only scanning specific group-id:s
for hpi artifacts, com.sonyericsson.rebuild isn't one of them.
But it is scanning com.sonyericsson.hudson.plugins.*
which is what we should use as standard groupId from now on.
Since the Extension point is in this branch now I bumped the version to 1.1.

jenkinsci/rebuild-plugin,bjacklyn/rebuild-plugin,hudson3-plugins/rebuild-plugin,rashmikanta-1984/rebuild-plugin,rashmikanta-1984/rebuild-plugin,bjacklyn/rebuild-plugin,jenkinsci/rebuild-plugin