Added an example to the readme

README.md

@@ -1,3 +1,14 @@
 Used to load and save PO files.
 
-    var po = require('po');
+    var po = require('po')  
+      , fs = require('fs')
+    
+    po.load('text.po', function(_po){
+      console.log(_po.headers);
+      console.log(_po.items);
+      
+      _po.save('copy.po', function(){
+        console.log('We copied a PO file for no reason!');
+      });
+    });
+    

tests/run.js

@@ -1,7 +1,6 @@
 var po = require('../lib/po.js')
   , fs = require('fs')
   , assert = require('assert')
-  , exec = require('child_process').exec;
   
 po.load('text.po', function(_po){
   _po.save('copy.po', function(){