Add post modify view

This allows moderators to modify posts (add sticky, etc).

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

board/static/board/style.css

@@ -85,6 +85,10 @@ th {
     clear: both;
 }
 
+.post_sticky {
+    font-weight: bold;
+}
+
 .post_id {
     cursor: pointer;
 }