App.Blade model object was never defined
renamed Quarry.Dns to Quarry.DnsSync (and App.Dns to App.DnsSync)
robustizing ajax conveniences

- jquery.ajax() wants a 'contentType' setting value for POST and PUT in order to perform a CORS OPTIONS pre-flight request
- we don't want to assume that a 'where' property will always be present in an object passed to Quarry.Model.find(); we're now verifying that it's there first, and that it's an object, before passing it into Quarry.Model.ajax()
cleaned up Logging API

also removed unnecessary that = this usage in Quarry.Model.find()
added 'hasFailedJobs' computed property to inform presentation layer of failed recent jobs

and added a simple red-colored icon in the navbar when there are failed jobs
adding ^$ to cluster string regex to search only that string