Use poltergeist for headless integration specs
Use webkit instead of poltergeist

Poltergeist has no support for dismissing confirm dialogs and drag and drop
seemed to fail with it. Webkit is almost a minute faster than selenium in our longest
running spec file: integration/location_page_spec

Webkit
1. 3.42
1. 3.35
1. 3.33

Selenium
1. 4.36
1. 4.22
1. 4.22
Run selenium in Travis
Fix spec
Use support method for confirming dialog
Use Ruby 2.0 for now
Modify click actions

Capybara-Webkit has a bug right now that won't click correctly on items that
have any sort of overlapping element. This is a fix until that is worked out.
Use selenium for drag and drop sortable specs only

Capybara's drag_to method does not work for these types of specs
Merge pull request #392 from G5/faster-specs-72987724

Faster Local Integration Specs