Update to 3.2.0

Documented: 
* add "tasks" feature for groups
* improve UX for adding a new person/family
* show a person's albums on profile page
* make "small group" size configurable
* add option for groups to include all adults in the community
* improve wording in various email messages
* add drag-and-drop sorting controls
* allow html source editing on wysiwyg editor
* add option to send prayer request as email
* document prayer requests
* document group messages
* Update welcome page
* document mailgun setting