node version up and enable strict mode

package.json

@@ -1,6 +1,6 @@
 {
   "name": "pretty-seconds",
-  "version": "0.1.0",
+  "version": "0.1.1",
   "description": "a very simple function to stringify any huge number of seconds. give it million seconds and it tells you how many days, hours, minutes and seconds in a pretty string.",
   "main": "pretty-seconds.js",
   "author": "Michael Heuberger <michael.heuberger@binarykitchen.com>",
@@ -14,7 +14,7 @@
   },
   "dependencies": null,
   "engines": {
-    "node": ">=0.6"
+    "node": ">=0.10.3"
   },
   "scripts": {
     "test": "nodeunit tests/basics.js"

pretty-seconds.js

@@ -1,3 +1,5 @@
+"use strict";
+
 module.exports = prettySeconds;
 
 function quantify(data, unit, value) {

tests/basics.js

@@ -1,3 +1,5 @@
+"use strict";
+
 var   testCase = require('nodeunit').testCase
     , prettySeconds;