Site Info/Favicon/Activity Definition fix

Adds more information about the SITE_NAME and generates full site for activity tests now

Added favicon to base.html

Changed the way activity definition permissions worked. Now, if different user submits an activity that has a definition that is different from the canonical version, this is the only time forbidden is raised. There was a bug that wouldn't allow others to submit a statement without having the exact canonical data listed (including just the activity ID as well). Non-activity owners can now just submit the ID which will show up when retrieving statements with 'exact' format and will still show canonical definition when queried with format 'canonical