Set DNX_BUILD_VERSION to APPVEYOR_BUILD_NUMBER when available.
Set DNX_BUILD_VERSION to APPVEYOR_BUILD_NUMBER when available.

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