Revert "Removed Board.open() and List.open() for the pull request"

This reverts commit 016dcc1.

trello/__init__.py

@@ -387,6 +387,13 @@ def close(self):
             post_args={'value': 'true', }, )
         self.closed = True
 
+    def open(self):
+        self.client.fetch_json(
+            '/boards/' + self.id + '/closed',
+            http_method='PUT',
+            post_args={'value': 'false', }, )
+        self.closed = False
+
     def get_list(self, list_id):
         '''Get list
 
@@ -676,6 +683,13 @@ def close(self):
             post_args={'value': 'true', }, )
         self.closed = True
 
+    def open(self):
+        self.client.fetch_json(
+            '/lists/' + self.id + '/closed',
+            http_method='PUT',
+            post_args={'value': 'false', }, )
+        self.closed = False
+
     def cardsCnt(self):
         return len(self.list_cards())