beatfactor/nightwatch — pull request #143 by scalvert (2014-04-25 15:19:29+00:00)
Title: Adding new attributeContains assertion

Adding new attributeContains assertion and tests

## Changes
- added new assertion
- added tests to verify validity of assertion

## How to test-drive this PR
- switch to branch
- run the tests
- add a new nightwatch test using attributeContains, and verify that the value is contained in the selected attribute