rbulkit 20180508 released
- Add 'init' and 'fini' pre- and post-commands hooks.
- Allow the use of regex for the job name definition and add %# backreference substitution in job commands.
- Allow %j and %# substitutions in job slots name.
- Add optional cost ∈ [0, 255] to jobs.
- Honour secondary groups when running as a different user.
- Update style of status report.
- do git fetch + reset --hard instead of pull to guarantee that the robotpkg tree has no local commits.