Adding santity check module to simplesamlphp. It checks things and reports if...

Adding santity check module to simplesamlphp. It checks things and reports if things are not working :) also supports using the cron hook

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@993 44740490-163a-0410-bde0-09ae8108e29a