Issue #372 - Add jquery.deparam vendor dependency.
Issue #372 - Uncomment pagination controls code; add page params.
Issue #372 - Add method to update model params from dropdown change.
Issue #372 - Forward all params from client to GitHub

We need to use the .copy() method because request.args is
an ImmutableMultiDict. This allows us to modify/update.
Issue #372 - Rename checkParams to checkURLParams
Issue #372 - DropdownView model now has paramKey and paramValue, rather than combined.
Issue #372 - Rename checkURLParams to loadIssues to be less confusing.
Issue #372 - Add default per_page and update page regex.
Issue #372: dropdown:change should fire key and value as distinct args.
Issue #372 - Use $.param to build params in updateIssues method

squash me with the updateIssues commit
Issue #372 - updateModelParams should take key, value args.
Issue #372 - pagination should use updateModelparams.

This will likely change once Links are followed.
Issue #372 - Functional tests for pagination dropdown
Issue #372 - store "page_limit" key as view object property
Issue #372 - Comment cleanup.
Issue #372 - jshint fixup
Merge pull request #418 from webcompat/372/1

Enable issues "pagination" dropdown. Fixes #372.