Reorganize Cron dashboard screen; add jobs drill-drown and enqueue-now action

[bensheldon]

Connects to #392.

• Creates more space by putting job properties within a collapsible element.
• Moves ActiveJobJob class out of the engine and into lib

[bensheldon]

@ssendev would you mind giving me some feedback on this Dashboard improvement for Cron?

https://goodjob-cron-entries-dr-1xjnji.herokuapp.com/good_job/cron_entries

[reczy]

wow, the dashboard is really coming along nicely!

@bensheldon - thoughts on a confirm popup before executing actions (particularly discard job?). I realize it's annoying if you're trying to act on many rows but I personally think the potential safety net there outweighs the inconvenience.

[bensheldon]

@reczy great suggestion! Yes, these should have confirm dialogs.

I should package up UJS as one of the assets. It makes life so much easier (and gives some niceties like disable, and some SJR desires I have for improving charts and auto-refreshing data)

[ssendev]

Oh, jeah this looks nice. Thanks for the quick implementation and i guess the project in general. One might say you did a good job ;-)