Changed NuGet package title to be Web API 2
Changed NuGet package title to be Web API 2

Replaced "2.1" with "2" to remove confusion since the package should work with 2.1 and 2.2.
twsouthwick/Autofac,SeriaWei/Autofac,twsouthwick/Autofac,laizhan/autofac,twsouthwick/Autofac,jruckert/Autofac,LexxFedoroff/Autofac,zmaruo/Autofac,neoe1984/https-github.com-autofac-Autofac,neoe1984/https-github.com-autofac-Autofac,onovotny/Autofac,jruckert/Autofac,oconics/Autofac,laizhan/autofac,onovotny/Autofac,liujunhua/Autofac,csantero/Autofac,lijianguang/Autofac,pagebrooks/Autofac,LexxFedoroff/Autofac,liujunhua/Autofac,csantero/Autofac,twsouthwick/Autofac,laizhan/autofac,jango2015/Autofac,twsouthwick/Autofac,pagebrooks/Autofac,SeriaWei/Autofac,zjmpds/Autofac,oconics/Autofac,laizhan/autofac,autofac/Autofac