Auto merge of #3500 - alexcrichton:appveyor-new-deploy, r=alexcrichton
Auto merge of #3500 - alexcrichton:appveyor-new-deploy, r=alexcrichton

Try using before_deploy on AppVeyor

tshepang/cargo,tshepang/cargo,eminence/cargo,durka/cargo,tsurai/cargo,vojtechkral/cargo,durka/cargo,tsurai/cargo,durka/cargo,vojtechkral/cargo,vojtechkral/cargo,eminence/cargo,achanda/cargo,eminence/cargo,rust-lang/cargo,nipunn1313/cargo,rust-lang/cargo,eminence/cargo,nipunn1313/cargo,sbeckeriv/cargo,nipunn1313/cargo,sbeckeriv/cargo,rustyhorde/cargo,vojtechkral/cargo,sbeckeriv/cargo,rustyhorde/cargo,durka/cargo,tshepang/cargo,achanda/cargo,rustyhorde/cargo,sbeckeriv/cargo,tsurai/cargo,achanda/cargo,achanda/cargo,rustyhorde/cargo,rust-lang/cargo,tsurai/cargo,tsurai/cargo,nipunn1313/cargo,rust-lang/cargo,tshepang/cargo