Update json.net

Author: ethanhann

IntegrationEngine.Core.Tests/packages.config

@@ -4,6 +4,6 @@
   <package id="Elasticsearch.Net" version="1.4.0" targetFramework="net45" />
   <package id="Moq" version="4.2.1409.1722" targetFramework="net45" />
   <package id="NEST" version="1.4.0" targetFramework="net45" />
-  <package id="Newtonsoft.Json" version="6.0.6" targetFramework="net45" />
+  <package id="Newtonsoft.Json" version="6.0.8" targetFramework="net45" />
   <package id="NUnit" version="2.6.4" targetFramework="net45" />
 </packages>