Add JS integration test for "pledging opens a new Amazon tab" #131
Description
Context
When you click the pledge button, you should see something similar to this:
That Amazon tab opening is one of the most critical features of this app, but right now, it's untested.
Issue Details
This issue is to add a feature test that verifies that clicking that button opens a new tab. This will require enabling javascript for the test and probably installing some js testing dependency (selenium, capybara-webkit, etc.). If an external dependency is needed, you'll also need to update the README and possibly bin/setup with instructions.
Ideally, this solution will be cross-platform and/or auto-skip the test for folks without the required dependencies. It definitely needs to run properly on Travis CI!