rose date -c: new option.

Short for `rose date $ROSE_TASK_CYCLE_TIME`.
Merge pull request #604 from matthewrmshin/rose-date-c

rose date -c: new option
rose misc: add documentation
Merge pull request #606 from benfitzpatrick/rose-misc.syntax-highlighting-kate

rose misc: add syntax highlighting documentation for Kate
Adds a timeout to cylc ping.
Merge pull request #608 from arjclark/hung-port-hotfix

cylc ping: add timeout