Added license infos

bootstrap/LICENSE.txt

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+Copyright 2011 Massimo Santini <santini@dsi.unimi.i>
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file 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.

bootstrap/NOTICE.txt

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+This work is derived in part from Bootstrap, from Twitter http://twitter.github.com/bootstrap/