Changed to using monodroid compiled protobuf-net.dll to avoid linker error with release build.

src/ProtoBuf/Licence.txt

@@ -0,0 +1,20 @@
+The core Protocol Buffers technology is provided courtesy of Google.
+At the time of writing, this is released under the BSD license.
+Full details can be found here:
+
+http://code.google.com/p/protobuf/
+
+
+This .NET implementation is Copyright 2008 Marc Gravell
+
+   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.

src/ProtoBuf/Readme.txt

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+The contents of this folder were generated by compiling the protobuf-net_MonoDroid project
+from the http://code.google.com/p/protobuf-net source code