Handcrafted VCR cassettes, made with love and care for passing tests
Update HoldingRequest creation feature for clarity
Remove Poltergeist from the dependencies since it seems incompatible with VCR

- Instead of running cucumber tests with Poltergeist and PhantomJS, use Selenium as the driver, Firefox as the browser (by default) and XVFB for headless GUI support in Travis
- To remove Poltergeist and its dependencies, update the bundled gems and lock them in
Merge branch 'feature/fix-travis' into development
Breadcrumb should say Articles for the NS2 institution
Add the NS2 institution
Add article search feature tests
Add citation linker feature tests
Add article routes and specs
Add articles controller and spec
Add article views and specs
Point staging environment to the features/article-search branch