Created database migration for friendships table: instead of two columns, there is one, status. Status is actually a tri-state variable.
 - If Status IS NULL, then the User referenced by 'user_id' WAS INVITED BY the user referenced by 'friend_id'
 - If Status if FALSE, then the User referenced by 'user_id' IS INVITING the user referenced by 'friend_id'
 - If Status is TRUE, the users are friends. Status will be true for both reciprocating friendships

 Other updates include updating queries in User model, updating User show page to show tables, updating friendship model, tweaks in css for users show page, updates to UsersController for getting information to display in User show page, and updating the FriendBook.mwb file for reference.