Add preliminary spec and placeholder code for new RecruiterSubmissionRecordFilter.
Add #before setup code for RecruiterSubmissionRecordFilter.
Add preliminary spec for RecruiterSubmissionRecordFilter#jobseekers.
Rename RecruiterSubmissionRecordFilter class to RecruiterSubmissionRecordFilterer to better describe its usage.
Add specs for RecruiterSubmissionRecordFilterer#jobseekers, testing its exclusivity.
Add preliminary spec for RecruiterSubmissionRecordFilterer#jobseekers_who_applied_on.
Fulfill preliminary spec for RecruiterSubmissionRecordFilterer#jobseekers_who_applied_on.

Add SubmissionRecord#recorded_on_date?.
Add preliminary spec and placeholder code for the new DateSubmissionRecordFilterer class.
Fulfill preliminary spec for DateSubmissionRecordFilterer and its #jobseekers method.
Remove extraneous RecruiterSubmissoinRecordFilterer#jobseekers_who_applied_on method.
Update DateSubmissionRecorderFilterer spec to generate a more exclusive example SubmissionRecordList.

Add (fulfilled) more exclusive spec for DateSubmissionRecordList#jobseekers.
Make the #before step for the DateSubmissionRecordFilterer spec more concise.
Add preliminary #before step and pending spec for the testing of combined filters.
Add completed, preliminary spec illustrating how to combine filters.
Move the specs for filter usage into its own filters_spec.rb file.