Content Views: Worked on package version filtering

Redid the existing package version filtering code, wrote some integration tests
for running our version filters against packages in ElasticSearch, added
support for epoch and release fields, and refactored some of the package rule
code.
Package filtering: added a tooltip for version formats
Content Views: Generating cassette for package filtering test
Merge pull request #2703 from daviddavis/more-version-filtering

Content Views: Worked on package version filtering