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* Fixes ``get_location`` to consider AngularJS synchronization, this is specially apparent on IE
* Adds ``element_attribute_should_contain`` and ``element_attribute_should_not_contain`` keywords to support element attribute verification
* Adds ``wait_until_location_contains`` and ``wait_until_location_does_not_contain`` to support current URL verification
* Adds more documentation
* Adds package registration as part of make task