Ajax load of Job Files list on Job Details Screen

This addresses DSC-854 where jobs with large number of files cause the page to load incorrectly. 
This change ajax loads the listing of the job files only when the accordion is clicked to view the full list.

* Added new route to JobsController for file list
* Created new folder called show under jobs and moved all show files into that location this is to make it easier to look that ever growing jobs folder 
* Add an ajax call on first click of the accordion to fetch the files
* Added a spinner to the CSS file to be used
* Added a number to the file display

@mossrocket will probably want to update my spinner.