adding job settings

the job_setting frequency will get used by g5-jobs to schedule inventory syncs
rspec3 syntax
deleting job_setting on update
Merge pull request #76 from G5/job-settings

adding job settings
reject nested attributes when blank
Merge pull request #77 from G5/nested-atts

reject nested attributes when blank
Add js format to entries controller

The g5-configurator needs this in order to spin up new client constellations.
This used to work but was removed in 7580f134d9bfb27f03e0ad76adbd3c2f28883712
Merge pull request #78 from G5/js-format-81632332

Add js format to entries controller
Require rack/cors
Don't protect from forgery

I tried modifying the rack-cors gem as advised via the interwebs but still got
the same error. The only way I can get this to work is to NOT protect from
forgery on the index action. Since this is a GET request I think this may be ok,
but looking for opinions.
Merge pull request #79 from G5/rack-cors-81632332

Fix ActionController::InvalidCrossOriginRequest errror
adding integration settings UID
removing unused action
determinate tests
Merge pull request #80 from G5/integration-uid

adding integration settings UID
take care of some merge conflicts