messages menu item

add a messages user menu item. Clicking this brings users to the Messages section; initially a user is brought to "Recent Conversations".
disable announcement section on homepage

need to rethink how we retrieve announcements and display them on homepage; shouldn't be based on forcing a guest login.
Merge branch 'feature-add_messages_to_user_menu' into develop
bumped version to 0.2.2
Merge branch 'release-0.2.2' into develop