Set node js to use environmental var set by PS

build/appveyor-project-version-patch.js

@@ -2,14 +2,8 @@
 var semver = require("semver");
 
 var file = "../src/imagesharp/project.json";
-var buildVersion = process.env.APPVEYOR_BUILD_VERSION.substring(1);
 
-var findPoint = buildVersion.lastIndexOf(".");
-var basePackageVer = buildVersion.substring(0, findPoint);
-var buildNumber = buildVersion.substring(findPoint + 1, buildVersion.length);
-var pad = "000000";
-var paddedBuildNumber = pad.substring(0, pad.length - buildNumber.length) + buildNumber;
-var semversion = semver.valid(basePackageVer + "-alpha" + paddedBuildNumber);
+var semversion = semver.valid(process.env.mssemver);
 
 jsonfile.readFile(file, function (err, project) {
 	project.version = semversion;