Bump to 1.6.1 and use version from submodule

Use the version from the submodule for the gem version. So it is
consistent with other types of toolkit packages.

Change the jenins.sh to update the version of the submodule as part of jenkins.sh and commit the updated submodule after the gem has been published. I can then update jenkins to push the master branch as a post build step.
This should probably be before the publish_gem step, so that gem_publisher tags the correct commit.

Additionally, I don't see anything that would push this new commit up to github.