Drupal 7.20
Issue #1934568 by David_Rothstein, pwolanin: Allow sites using the 'image_allow_insecure_derivatives' variable to have partial protection from the security issues fixed in Drupal 7.20.
Prepare Drupal 7.21 release.
Merge tag '7.21' of git://github.com/drupal/drupal

7.21 release
updates to modules
libraries
link
references
token
views
votingapi