Point "View All Jobs" to search url, not secure.my.jobs [MJ-901]
Several changes and improvements [MJ-901]

- Replace testfixtures with mock now that we're actually using mock
- Update return_file to do network access if the requested url was unknown (was breaking stuff in postajob)
- Lots of PEP 8
Default to saved search url, not feed [MJ-901]
Merge pull request #673 from DirectEmployers/saved-search-view-all-jobs

Saved Search - Change "View All Jobs" links [MJ-901]