added guide and notes for upgrades 3.1 to 3.3
added 3.1 to 3.3 upgrade guide. Moved upgrade section futher down in the doctree
fixed typos
formating
added kolab_files.inc.php
Merge pull request #32 from dhoffend/updates

Added Upgrade Guide for 3.1 to 3.3
Merge pull request #33 from thomascube/master

Update Wallace invitation policy settings reference...
Updated the Bonnie Architecture and Design section to reflect the current development status; removed the ORM/Changelog part