Update Jenkinsfile to support bugfix branches and pull requests.

Jenkinsfile

@@ -3,8 +3,7 @@ node {
     /**
     * Branch should be in gitflow format.  If not, then we'll abort.
     */
-
-    if(!env.BRANCH_NAME.matches(/(feature|hotfix|release)\/.+/)) {
+    if(!env.BRANCH_NAME.matches(/(feature|hotfix|bugfix|release)\/.+/) && !test.matches(/^PR-.*$/)) {
       hipchatSend message: "${env.BRANCH_NAME} Build: Does not match gitflow naming. Aborted", room: 'engineering'
       error "Job does not follow gitflow naming format."
     }