Updating webform to 3.20 for 4.2.6 release.
Updating Drupal core version to 7.27.
Changing springboard version to 7.x-4.2.6-RC1
Updated repo versions for the make file
Merge tag '7.x-4.2.6' into 7.x-4.x

Updated to 7.x-4.2.6
Added patch for drupal 7.27 where ajax.js is broken for IE 8 and older browsers.