Removed unimplemented Exception.GetObjectData override methods.

They weren't implemented anyway, and seem to be causing trouble with certain CLR 4 hosters (like Rackspace).

Fixes #121

src/DotNetOpenAuth.Core/Messaging/Bindings/CryptoKeyCollisionException.cs

@@ -43,6 +43,7 @@ public class CryptoKeyCollisionException : ArgumentException {
 			throw new NotImplementedException();
 		}
 
+#if false
 		/// <summary>
 		/// When overridden in a derived class, sets the <see cref="T:System.Runtime.Serialization.SerializationInfo"/> with information about the exception.
 		/// </summary>
@@ -64,5 +65,6 @@ public class CryptoKeyCollisionException : ArgumentException {
 			base.GetObjectData(info, context);
 			throw new NotImplementedException();
 		}
+#endif
 	}
 }

src/DotNetOpenAuth.Core/Messaging/ProtocolException.cs

@@ -68,6 +68,7 @@ protected internal ProtocolException(string message, IProtocolMessage faultedMes
 		/// </summary>
 		internal IProtocolMessage FaultedMessage { get; private set; }
 
+#if false
 		/// <summary>
 		/// When overridden in a derived class, sets the <see cref="T:System.Runtime.Serialization.SerializationInfo"/> with information about the exception.
 		/// </summary>
@@ -89,5 +90,6 @@ protected internal ProtocolException(string message, IProtocolMessage faultedMes
 			base.GetObjectData(info, context);
 			throw new NotImplementedException();
 		}
+#endif
 	}
 }