title: dictionaryWithContentsOfFile Returns Nil rather the NSdictionary
body: <p>I have created a file named Dict.json .Contents of the file are valid json containg</p>
  
  <blockquote>
    <p>{"mydata":[{
               "A":4,
               "B":14,
               "C":7
               },
               {
               "A":4,
               "B":12,
               "C":7
               },
               {
               "A":34,
               "B":154,
               "C":6
               },
               {
               "A":34,
               "B":162,
               "C":6
               }]}</p>
  </blockquote>
  
  <p>I want to create a NSDictonary from this file .I tried the following but it returns nil .</p>
  
  <blockquote>
    <p>NSString *filePath = [[NSBundle mainBundle] pathForResource:@"Dict" ofType:@"json"];
    NSMutableDictionary *newArr1=[NSMutableDictionary dictionaryWithContentsOfFile:filePath];</p>
  </blockquote>
  
  <p>I am also checking that file is not nil;</p>
  
  <pre><code>NSData *myData = [NSData dataWithContentsOfFile:filePath];
  if (myData) {
      NSLog("There is Data in File !!!!")  
  }
  </code></pre>