Update to JIRA version 6.3.6

Currently available at https://www.atlassian.com/software/jira/download

Signed-off-by: Gianpaolo Macario <gmacario@gmail.com>
Cleanup comments
Comment script debugging flag (set -x)
Merge pull request #22 from gmacario/update-jira-636

Update to JIRA version 6.3.6