Fix copyright lines for all C# code.

Everything should now be consistent - the only difference between files is the year (aside from generated files).

Fixes issue #531.
diff --git a/csharp/src/ProtocolBuffers/CodedInputStream.cs b/csharp/src/ProtocolBuffers/CodedInputStream.cs
index 5c64fd9..ef7cf11 100644
--- a/csharp/src/ProtocolBuffers/CodedInputStream.cs
+++ b/csharp/src/ProtocolBuffers/CodedInputStream.cs
@@ -1,10 +1,7 @@
 #region Copyright notice and license

-

 // Protocol Buffers - Google's data interchange format

 // Copyright 2008 Google Inc.  All rights reserved.

-// http://github.com/jskeet/dotnet-protobufs/

-// Original C++/Java/Python code:

-// http://code.google.com/p/protobuf/

+// https://developers.google.com/protocol-buffers/

 //

 // Redistribution and use in source and binary forms, with or without

 // modification, are permitted provided that the following conditions are

@@ -31,7 +28,6 @@
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

-

 #endregion

 

 using System;