add install script

package.json

@@ -4,7 +4,8 @@
   "description": "Wrapper around the WMI client. Linux and Windows WMI clients are supported.",
   "main": "index.js",
   "scripts": {
-    "test": "npm test"
+    "test": "npm test",
+    "install": "node scripts/install.js"
   },
   "repository": {
     "type": "git",

scripts/install.js

@@ -0,0 +1,7 @@
+var fs = require('fs');
+var path = require('path');
+
+if (process.platform === 'linux') {
+    fs.chmodSync(path.join(__dirname, '..', 'bin', 'wmic_centos_x64'), 777);
+    fs.chmodSync(path.join(__dirname, '..', 'bin', 'wmic_ubuntu_x64'), 777);
+}