Install phantomjs-node

So's we can test computed CSS
Swap test dependencies

- Use phantomJS as driver to assert CSS
- Remove other driver or CSS-y libraries
- Use chai instead of expect.js
Test HTML and CSS with PhantomJS

- Adds a helper function that'll be extracted later
Obsessing about readability
Remove unnecessary done messages
A before() must finish for tests to be relevant

Right?
Re-wording the specs for readability
Merge pull request #1 from adorableio/working_tests

Sample tests with nicer experience