Test suite can be run along with following environment variables:
- WITH_JS=1: Run tests using Poltergeist driver
- DEBUG=1: Open HTML page (and screenshot for JS tests) when tests fail
- DEBUG=js: Run suite with Poltergeist, and JS debugging and inspector
- COVERAGE=1: Run rspec suite with Simplecov coverage
- WITH_JS=1: Run rspec suite with Poltergeist