Changed the way the mock api endpoint works to clear all api responses at the start of a scenario and provides a confirm api responses step defition

Added new sub module behat_testing_mock_api which gives a mock endpoint for the testing of expectations from a mocked api

Changed the use_existing_test_database yml entry to reset_database. If reset_database is set to TRUE then the database is cloned, otherwise an existing test database is used. If there isnt an existing test database it si cloned automatically

Added a test ID variable which is set at the start of the tests. The token [tid] can be added as variables in features to use this id and so add some uniqueness to a test

Issue #1850932 by ceng: Renamed some of the parameters in the behat.yml file to make them more obvious. Changed the test db prefix from 65 to 101 for orwellian reasons

Issue #1850932 by ceng: Tested all three profile types and checked the expected behaviour against the sample project on the project homepage. Checked site was not being modified in any but the live profile

Restoring options, removing MyDrupalContext in its default location, drush and documentation changes