Fix Waiter class definition
Do not include Waiter in the page class as Waiter is now a class.
Revert "Merge pull request #3 from centro/revert_pull_request_1"

This reverts commit e38952efc8776f563fa740f2f8678e5334c274f0, reversing
changes made to ea2e63c1052980155d4287af8a2e03a8d548c5f5.
Merge branch 'wait_for_url_loaded' into revert_waiter_revert
Merge pull request #5 from centro/revert_waiter_revert

Revert waiter revert