Fix git command in deploy.sh
Fix git command in deploy.sh

Because jenkins works on a detached HEAD, the git command that we were using to try to push the commits back up to github was invalid.  This commit changes the script to use an environment variable (populated by a Jenkins build parameter) to determine the correct branch name.
scotje/trapperkeeper,senior/trapperkeeper,senior/trapperkeeper,camlow325/trapperkeeper,puppetlabs/trapperkeeper,rbramwell/trapperkeeper