Updated the Exceptionless.Mvc package to compile against MVC4 instead of MVC3. MVC3 no longer ships with VS2013 and as such will cause the project to not compile. Also the usage of MVC3 is very low:

http://www.nuget.org/stats/packages/AspNetMvc?groupby=Version
http://www.nuget.org/stats/packages/Microsoft.AspNet.Mvc?groupby=Version
Merge branch 'master' of https://github.com/exceptionless/Exceptionless