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.
 - More... This release looks rather large.

### [7.29](https://www.drupal.org/drupal-7.29-release-notes)
 - hook_file_download() behaves differently.
 - Form API now automatically sanitizes option group labels.  If you see double escaped option group labels, then disable your own sanitization.

### [7.30](https://www.drupal.org/drupal-7.30-release-notes)
 - Fixes a serious regression from 7.29.
 - Warns about the "view site reports" permission needing to be restricted to trusted users.
 - Documentation updates.