** Bumped vesion into 3.1.1
** Removed malfunctioning transport-guarantee directives from web.xml
and added /gamelibrary/* to HttpsRedirectFilter
** Removed deprecation warnings
** Lowered session timeout to 5 minutes
** Added keep-alive poller that keeps the session alive when user has
just left the page open
** Changed logout to invalidate session instead of calling directly the
SessionContoller logout method
** Changed SessionController to logout user when session is invalidated
(throws an logout event)
** Added listener for closing open CoOpsSesssion when user has logged
out
** Fixed a bug that caused justify icons to be missing from document
editor
** Changed visibility of createFile to public in MaterialController
** Fixed a bug in uploadHtml method of MaterialController that caused
html material uploading to always fail on internal error
** Added a download parameter into materials servlet that determines
wheter material is to be downloaded or displayed in browser
** Added support for uploading files into Forge without converting them
into Forge & Illusion formats
** Removed error mailer
** Changed version number into 3.1.1