Functional testing

[ian-ross]

• Move Webpack setup into development VM
• Functional test support: Selenium + PhantomJS
• Functional testing infrastructure: test runner and "pages" pattern
• Functional tests for: login, registration, user profile editing
• Functional tests on Travis (doesn't work yet)

See documentation at:

• https://github.com/Cadasta/cadasta-platform/wiki/Running-functional-tests
• https://github.com/Cadasta/cadasta-platform/wiki/Writing-functional-tests

[ian-ross]

I spent a hellish Sunday trying to get this working on Travis. Complete mystery why it doesn't work -- I tried running the LiveServerTestCase tests directly on port 5000, I tried running nginx on Travis with the same reverse proxy setup that we use in the development VM, and after more than 30 attempts, I just gave up. Maybe I'll have enough energy to try again next week. In the meantime, functional tests work well in the VM, using PhantomJS. I'm sure there will be some iteration with the "page" pattern I've started on as we come up with more reusable components for testing, but I think it looks not bad as a starting point.