Upgrade to drupal 7.30

Invalidates #25.

This also removes the patch for a regression in 7.27 where ajax wouldn't work on older browsers like IE8.  That bug was fixed in 7.28.

## Release notes
### [7.28](https://www.drupal.org/drupal-7.28-release-notes)
 - Fixes an ajax bug in older browsers introduced in 7.27.

### [7.29](https://www.drupal.org/drupal-7.29-release-notes)


### [7.30](https://www.drupal.org/drupal-7.30-release-notes)
 - Fixes a regression from 7.29.
 - Warns about the "view site reports" permission needing to be restricted to trusted users.
 - Documentation updates.