I got following warning when build my solution
Consider app.config remapping of assembly "WebGrease, Culture=neutral, PublicKeyToken=31bf3856ad364e35" from Version "1.0.0.0" [] to Version "1.3.0.0" [*\WebGrease.1.3.0\lib\WebGrease.dll] to solve conflict and get rid of warning.
I have followling line in web.config
<dependentAssembly><assemblyIdentity name="WebGrease" publicKeyToken="31bf3856ad364e35" /><bindingRedirect oldVersion="0.0.0.0-1.3.0.0" newVersion="1.3.0.0" /></dependentAssembly>