Stub proxy methods in Twitter parser

Change-Id: Ia23869ff1259e460f3389a425fc9e0e4a0a31955
Depends-On: I6a37f6955728aa732dcf0ba27bfa25749f250b3d
Reviewed-on: http://gerrit.dmdirc.com/2178
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager

src/com/dmdirc/addons/parser_twitter/Twitter.java

         return "";
     }
 
+    /** {@inheritDoc} */
+    @Override
+    public URI getProxy() {
+        return null;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public void setProxy(final URI proxy) {
+        // TODO: Not supported (yet)
+    }
+
     /** {@inheritDoc} */
     @Override
     public Map<Object, Object> getMap() {