Issue #372 - Functional tests for pagination dropdown
Issue #420 - Add getNextPage and getPrevPage methods to model.
Issue #420 - encode URLs before we send them to the server.
Issue #420 - Support merging params with encoded link URLs.
Issue #420 - set per_page defaults in updateIssues
Issue #420 - Return null if we didn't get a Link header

(when checking to enable or disable pagination links)
Issue #420 - Remove obsolete pagination methods from IssueCollection
Issue #420 - Handle Search API and Issues API results differences in model

Search comes back as an object, with issues in the items key.
Issues is just an array.
Issue #420 - Modify /issues/search/untriaged to accept categories

This is a temporary workaround of GitHub's lack of sending
Link headers to the Issues API filtered by label. They have been
contacted and confirmed they are tracking it via an internal issue.
Issue #420 - Fetch named label filters from /issues/search/ endpoint

"closed" remains at /issues/category because requesting issues by
issue state correctly returns Link headers.
Issue #420 - Rewrite Link headers
Issue #420 - Add compound rewrite_and_sanitize_link method.
Issue #420 - Add tests for helper methods.
Issue #420 - Avoid duplicate params
Merge pull request #446 from webcompat/issues/420/2

Fixes #420 - Follow Link header links for pagination traversal.