Deprecated css_* methods in favor of queries
Deprecated fulfill_before and fulfill_after in favor of Promise.fulfill()
Replaced Splinter dependency direct Selenium calls
Deprecate SubQuery in favor of XPath
Added query methods to check element visibility.
Added query method for retrieving the "nth" element.
Updated API documentation, using napoleon syntax for all public methods.
Merge pull request #32 from edx/will/query-promise-selenium-refactor

Query/Promise/Selenium Refactor