Reverted removal of StreamingContext from the OnDeserialized method.

The OnDeserialized method requires a StreamingContext parameter.

Attempting to use the WCF profiler was throwing the following exception:

System.Runtime.Serialization.InvalidDataContractException: Serialization
Callback 'Void OnDeserialized()' in type
'StackExchange.Profiling.MiniProfiler' must have a single parameter of
type 'System.Runtime.Serialization.StreamingContext'.
Added WCF nuspect file.

Added a nuspec file to enable the for MiniProfiler.WCF package at
https://nuget.org/packages/MiniProfiler.WCF
Merge pull request #168 from a-h/master

The OnDeserialized method requires a StreamingContext parameter. (Issue 167)