Rename phantom wrapper

This isn't Gozer, gozer is the driver that uses phantom.
Rename Page to Gozer

Gozer drives phantomJS and provides a capybara-like interface.
Shorten reference to phantom wrapper
Allow chaining of page methods

Return the instance on state-setting methods. Update examples with new
ability.
Reorder methods

Separate state-setting, chainable methods from evaluating, value-returning methods
Pass host and port to Gozer constructor
Reject if phantom can't open the page
Put driver instantiation in beforeAll block
Merge pull request #4 from adorableio/gozer

Gozerify