windows pm2 install fix

Author: Unitech

lib/API/Modules/LOCAL.js

@@ -106,7 +106,8 @@ function installLangModule(module_name, cb) {
   var install_instance = spawn(cst.IS_WINDOWS ? 'npm.cmd' : 'npm', ['install', module_name, '--loglevel=error'], {
     stdio : 'inherit',
     env: process.env,
-    cwd : node_module_path
+    cwd : node_module_path,
+    shell : cst.IS_WINDOWS
   });
 
   install_instance.on('close', function(code) {

lib/API/Modules/NPM.js

@@ -190,7 +190,8 @@ function getNPMCommandLine(module_name, install_path) {
     return spawn.bind(this, cst.IS_WINDOWS ? 'npm.cmd' : 'npm', ['install', module_name, '--loglevel=error', '--prefix', install_path], {
       stdio : 'inherit',
       env: process.env,
-      windowsHide: true
+      windowsHide: true,
+      shell : cst.IS_WINDOWS
     })
   }
   else {