update timestamp in block; update saving of timestamps for events; fix notice when no html version is available; update version above what is available on magento connect; add migration to fix timestamp storage

* 'master' of https://github.com/chuckdrew/mailgun_magento:
  Update README.md

Modified sql install script - email/event constraint was not working because the foreign key was signed and the referenced key was unsigned. Foreign key is now unsigned.