up to 2013-05-10a hotfix

The hotfix released 2013-06-16 contains the following fixes:

- Several fixes related to the new Auth-Plugins (especially LDAP, AD and MySQL)
- Improvements to the random password generator and introduction of AUTH_PASSWORD_GENERATE
- Better password reset tokens
- A fix for image rescaling (Precondition failed problem)
_ A fix related to Internet Explorer's compatibility mode