_explanation is a reserved additional field

fixes #WEBINTERFACE-390
Wrong image URL to messages from today sun icon

fixes #WEBINTERFACE-387
fix mongodb indexes in users model

Allow null values in users.remember_token and users.api_key
When new users are created, mongodb rejects inserts starting
with the second user.
LDAP enhancements to support non-Active Directory servers, direct bind authentication, subtree search authentication (with optional search binding), and TLS encryption.
Allow externalization of configuration files (especially handy if deployed with JRuby as a .WAR file)
Formatting
The missing graph grids are back

fixes #WEBINTERFACE-394
removed "really" link in full message links

fixes #WEBINTERFACE-388
cleaned up the routes ghetto a bit
Config switch for demos that only allows GET reqs

This will redirect all non-GET requests to /messages if is_demo_system in general.yml is set to true.
make logins in demo system work. block configs
Fix for failed authentication - Net::LDAP returns False, which does not expose a "first" method.
plugin fixes