Updated WebAPI package version to 3.3.1
Updated WebAPI package version to 3.3.1

Updated the WebAPI integration package to 3.3.1 to account for PR #535
(minor update to RegisterWebApiModelBinders).

liujunhua/Autofac,pagebrooks/Autofac,zjmpds/Autofac,oconics/Autofac,pagebrooks/Autofac,liujunhua/Autofac,csantero/Autofac,SeriaWei/Autofac,laizhan/autofac,neoe1984/https-github.com-autofac-Autofac,twsouthwick/Autofac,twsouthwick/Autofac,lijianguang/Autofac,laizhan/autofac,laizhan/autofac,onovotny/Autofac,onovotny/Autofac,twsouthwick/Autofac,autofac/Autofac,LexxFedoroff/Autofac,twsouthwick/Autofac,LexxFedoroff/Autofac,jruckert/Autofac,neoe1984/https-github.com-autofac-Autofac,zmaruo/Autofac,laizhan/autofac,csantero/Autofac,twsouthwick/Autofac,oconics/Autofac,jango2015/Autofac,SeriaWei/Autofac,jruckert/Autofac