Issue #2262917 by sylus: Update Drupal Core to 7.28.
Update CHANGELOG.
Fix Behat tests for static methods.
Update git hashes for Drupal WxT.
Update git hashes for Drupal WxT.
Update git hashes for Drupal WxT.
Update git hashes for Drupal WxT.
Merge pull request #1475 from sylus/7.x-1.x

Issue #2262917 by sylus: Update Drupal Core to 7.28.