temporary_invitation 5.x-2.3

security bugfix:
* fixing XSS problem when displaying invitations

other fixes and improvements since 5.x-2.2:

* Put the preview form elements in a common parent item too,
and make it a bit more themeable.
* Make it possible for modules to alter the email template and body.
* Streamline message template retrieval, and make it pluggable too.
* Update the copyright notices, and remove the amateur GPL header
(drupal.org now explicitely states GPLv2+ anyways).
* Reduce code duplication by centralizing mail text replacements into a
separate function. Also, reduce complexity by moving replacements out of
the _temporary_invitation_get_message_template() function.
* Provide a token for the invitation creation date.
* Sort loaded arrays by creation date (newest first).
* Record and show the creation date of an invitation.
* Make redirection more robust against $_REQUEST['destination'] paths
that might be set by hook_user() and confuse guest users as they don't
get to the target path.
* Add a setting to control the maximum number of invitations per hour.