Update SavedSearch last sent when sending as part of a SavedSearchDigest [PD-818]
Removed limiting by frequency from saved search emails and forced partner saved search emails to send even if there are no search results
Saved search digests should also send no matter what for partner saved searches [PD-820]
More tests for searches with no jobs [PD-820]
Made the very bad if statement worse by also checking to make sure we shouldn't just ignore dates for jobs
Started working on some better tests for saved searches
Created better tests for sending saved searches based on time
Merge branch 'master' of github.com:DirectEmployers/MyJobs into pss-email-problems

Conflicts:
	mysearches/tests/test_models.py
Merge pull request #1046 from DirectEmployers/pss-email-problems

Pss email problems [PD-820][PD-818]