remove install section from package.json, and rebuild.js. npm executes…

remove install section from package.json, and rebuild.js. npm executes binding.gyp automatically. ref https://npmjs.org/doc/json.html

package.json

@@ -24,7 +24,6 @@
     "url": "git://github.com/andrew/node-sass.git"
   },
   "scripts": {
-    "install": "node rebuild.js",
     "test": "mocha test"
   },
   "bin": {

rebuild.js

-var spawn = require('child_process').spawn;
-
-spawn('node-gyp', ['rebuild']);