How to Unbuild Packages

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I want to take some packages off the build farm. I tried moving the package.xmls to package.xml.NOBUILD (as I've seen done) but after I prepare my catkin release, the packages won't bloom-release.

==> git push --tags
Total 0 (delta 0), reused 0 (delta 0)
To <a href="https://github.com/brown-release/nasa_r2_simulator_release">https://github.com/brown-release/nasa_r2_simulator_release</a>
 * [new tag]         debian/ros-hydro-r2-gazebo_0.5.4-1_precise -> debian/ros-hydro-r2-gazebo_0.5.4-1_precise
 * [new tag]         debian/ros-hydro-r2-gazebo_0.5.4-1_quantal -> debian/ros-hydro-r2-gazebo_0.5.4-1_quantal
 * [new tag]         debian/ros-hydro-r2-gazebo_0.5.4-1_raring -> debian/ros-hydro-r2-gazebo_0.5.4-1_raring
 * [new tag]         release/hydro/r2_gazebo/0.5.4-1 -> release/hydro/r2_gazebo/0.5.4-1
 ! [rejected]        debian/ros-hydro-gazebo-gripper_0.5.3-1_precise -> debian/ros-hydro-gazebo-gripper_0.5.3-1_precise (already exists)
 ! [rejected]        debian/ros-hydro-gazebo-gripper_0.5.3-1_quantal -> debian/ros-hydro-gazebo-gripper_0.5.3-1_quantal (already exists)
 ! [rejected]        debian/ros-hydro-gazebo-gripper_0.5.3-1_raring -> debian/ros-hydro-gazebo-gripper_0.5.3-1_raring (already exists)
 etc....