jenkinsci/jenkins — pull request #434 by dserodio (2012-04-11 20:49:22+00:00)
Title: [JENKINS-13423] Environment Variables documentation missing GIT_COMMIT and GIT_BRANCH

This commit adds documentation for these, copied from the [Jenkins Wiki](https://wiki.jenkins-ci.org/display/JENKINS/Building+a+software+project#Buildingasoftwareproject-JenkinsSetEnvironmentVariables) but with "Gitish" replaced with "SHA-1 hash".