Fixed #344 - Added remove manager to remove bi-directional friendship…

… relation

Signed-off-by: James Tauber <jtauber@jtauber.com>

friends/models.py

@@ -63,6 +63,13 @@ def are_friends(self, user1, user2):
             return True
         return False
 
+    def remove(self, user1, user2):
+        if self.filter(from_user=user1, to_user=user2):
+            friendship = self.filter(from_user=user1, to_user=user2)
+        elif self.filter(from_user=user2, to_user=user1):
+            friendship = self.filter(from_user=user2, to_user=user1)
+        friendship.delete()
+
 
 class Friendship(models.Model):
     """