Redirect views for polymorphic base views, like for Directives.
Refactoring of how views are loaded to allow for choosing an alternate
view class patterned after how it is done in ggrc.services. Further
refactoring of url_for patterns to avoid circular imports.
remove obsolete util packages.
Remove unnecessary print statement
Merge remote-tracking branch 'origin/develop' into feature/polymorphic-redirects
Remove unneeded import
Merge pull request #215 from reciprocity/feature/polymorphic-redirects

Redirects for Directive view links to the view for the polymorphic subtype.