Revert "Bump AppVeyor to use Visual Studio 2015"
Revert "Bump AppVeyor to use Visual Studio 2015"

This reverts commit 901f41149b79b173a7861b7871031dd2b52d8d3d.

Smartbank/node-sass,nschonni/node-sass,sass/node-sass,am11/node-sass,sass/node-sass,Smartbank/node-sass,sass/node-sass,xzyfer/node-sass,sass/node-sass,saper/node-sass,ankurp/node-sass,am11/node-sass,saper/node-sass,nschonni/node-sass,ankurp/node-sass,ankurp/node-sass,saper/node-sass,nschonni/node-sass,Smartbank/node-sass,xzyfer/node-sass,Smartbank/node-sass,am11/node-sass,sass/node-sass,paulcbetts/node-sass,saper/node-sass,xzyfer/node-sass,ankurp/node-sass,sass/node-sass,nschonni/node-sass,Smartbank/node-sass,nschonni/node-sass,paulcbetts/node-sass,xzyfer/node-sass,xzyfer/node-sass,xzyfer/node-sass,saper/node-sass,paulcbetts/node-sass,Smartbank/node-sass,sass/node-sass,saper/node-sass,xzyfer/node-sass,saper/node-sass,paulcbetts/node-sass,nschonni/node-sass,am11/node-sass,Smartbank/node-sass,nschonni/node-sass