Implement Continuous Integration. Fixes WEBSPARK-86.

 * Adding .travis.yml for continuous integration with Travis-ci.org
 * Modified Panopoly Behat test suite to pass with current build
 * See https://travis-ci.org/ASU/webspark-drops-drupal7
Merge pull request #7 from ASU/86-implement-continuous-integration

 Implement Continuous Integration. Fixes WEBSPARK-86.