Added safety around AutoMock.Dispose so multiple disposals won't cause issues.
Added safety around AutoMock.Dispose so multiple disposals won't cause issues.

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