Add more to the NOTICE.txt

NOTICE

-CodeJail
-
-Copyright 2013-2015, edX

NOTICE.txt

+CodeJail
+
+Copyright 2013-2015, edX
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this work except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.