Implement contain_consecutive_elements and fix tests

- Add contain_consecutive_elements chai assertion
- Fix 'loads Mychas test helper before the test files' test
Remove temporary variable per PR feedback
Merge branch 'master' into contain_consecutive_elements

Conflicts:
	test/mycha_spec.coffee
	test/test_helper.coffee
Move chai assertions to their own directory
Merge pull request #22 from Originate/contain_consecutive_elements

Implement contain_consecutive_elements and fix tests