Cleanup and a few new feature additions

This updated does the following misc adds:

 - Added ability to create new wikis
 - Added filter to prevent wikis from being deleted unless user is wiki owner
 - Added filter to make sure user is logged in before they can edit/update wikis
 - Made the content part of wikis a text area instead of small text field
 - Added created_by and last_edited_by data to the wikis