Add email template for saved searches and digests [MJ-250]

Fix formatting of rss.rss
Improve tests for new emails
Fix issue with feed acquisition on single search emails [MJ-250]
Properly handle feed urls with no question marks [MJ-250]
Redo remote/local file mapping [MJ-250]
Merge pull request #163 from DirectEmployers/saved-search-email-templates__MJ-250

Saved Search - new email templates - MJ-250