appveyor: try to get node-webkit publishing [publish binary]

scripts/build_for_node_webkit.cmd

@@ -3,13 +3,13 @@ echo The list of environment variables:
 set
 if not "%1" == "x86" goto end
 if "%nw_version%" == "" goto end
-npm install nw-gyp
-cinst wget 7zip.commandline
-wget http://dl.node-webkit.org/v%nw_version%/node-webkit-v%nw_version%-win-ia32.zip
-7z e -onw node-webkit-v%nw_version%-win-ia32.zip
+call npm install nw-gyp
+call cinst wget 7zip.commandline
+call wget http://dl.node-webkit.org/v%nw_version%/node-webkit-v%nw_version%-win-ia32.zip
+call 7z e -onw node-webkit-v%nw_version%-win-ia32.zip
 dir nw
 set PATH=nw;%PATH%
-node-pre-gyp rebuild --runtime=node-webkit --target=%nw_version% --target_arch=ia32
-node-pre-gyp package testpackage --runtime=node-webkit --target=%nw_version% --target_arch=ia32
-if not "%CM%" == "%CM:[publish binary]=%" node-pre-gyp publish --msvs_version=2013 --runtime=node-webkit --target=%nw_version% --target_arch=ia32
+call node-pre-gyp rebuild --runtime=node-webkit --target=%nw_version% --target_arch=ia32
+call node-pre-gyp package testpackage --runtime=node-webkit --target=%nw_version% --target_arch=ia32
+if not "%CM%" == "%CM:[publish binary]=%" call node-pre-gyp publish --msvs_version=2013 --runtime=node-webkit --target=%nw_version% --target_arch=ia32
 :end
\ No newline at end of file