Jobs display improvements

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Three updates to the jobs display:

1. There should be a pop-up when you hover over the server image that says "Jobs" or something to that effect
2. The table should show which study or analysis the job is related to
3. The table should show when the job started in addition to the heartbeat

If this is too much to display in the window, then when a user clicks the plus button, this information should be shown.

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We should also consider color-coding the jobs based on status for easy user-feedback

[antgonza]

Renaming issue and joining with https://github.com/biocore/qiita/issues/2186.

The new improvements to the job display are:

• [x] Allow to remove/hide jobs
• [ ] Job show which study or analysis the job is related to
• [ ] Job should show when the job started in addition to the heartbeat <- this might be more difficult than expected but let's check.
• [ ] ignore successful, waiting jobs, it looks like they are still shown ...