Normalize runtime name for binary installation

lib/extensions.js

@@ -8,9 +8,11 @@ var semver = require('semver'),
  */
 
 function getRuntimeName() {
-  return process.execPath
+  var runtime = process.execPath
         .split(/[\\/]+/).pop()
         .split('.').shift();
+
+  return runtime === 'node' || runtime === 'nodejs' ? 'node' : runtime;
 }
 
 /**