ENH: ship msgpack as pandas submodule to enable customization for pandas use cases, per #3814 and others

Author: wesm

LICENSES/MSGPACK_LICENSE

@@ -0,0 +1,13 @@
+Copyright (C) 2008-2011 INADA Naoki <[email protected]>
+
+   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.

RELEASE.rst

@@ -51,6 +51,7 @@ pandas 0.11.1
   - A ``filter`` method on grouped Series or DataFrames returns a subset of
     the original (GH3680_, GH919_)
   - Access to historical Google Finance data in pandas.io.data (GH3814_)
+  - Add pandas.msgpack submodule
 
 **Improvements to existing features**