Implicitly wait for the page url to be displayed within some amount of time.
Reduce dependency on Capybara.default_wait_time by wrapping in locally controlled variable.
Remove test for wait_until_displayed method which was added and subsequently removed from the Page class.
Add tests for new Waiter class and implicit wait functionality for the Page.displayed? method.
Fix Waiter class definition
Do not include Waiter in the page class as Waiter is now a class.
Merge centro_production into wait_for_url_loaded
Merge branch 'wait_for_url_loaded' into merge_capybara_matchers_with_centro_production_branch