Add preliminary spec for JobSearcher and JobSearcher#posted_by.
Refactor JobSearcher spec to test specific versions of #posted_by.
Fulfill preliminary specs for the new JobSearcher class.
Fulfill preliminary specs for the new JobSearcher class.
Move JobApplication* and JobApplicationSubmission* classes into their own packages.
Move JobApplicationSubmissionService into jobapplicationsubmissions.rb.
Move SavedJobRecord* classes in to their own savedjobs.rb package.
Move JobApplicationSubmissonRecord* classes into their own package.