Avoid running native tests with node < 4.0.0

test/cli.js

@@ -1,10 +1,14 @@
 var ConnectionParameters = require(__dirname + '/../lib/connection-parameters');
 var config = new ConnectionParameters(process.argv[2]);
+var semver = require('semver')
 
 for(var i = 0; i < process.argv.length; i++) {
   switch(process.argv[i].toLowerCase()) {
   case 'native':
+    if (semver.gte(process.version, '4.0.0')) {
+      console.log('Not running native in node < v4.0.0')
       config.native = true;
+    }
     break;
   case 'binary':
     config.binary = true;