XHR callbacks - problems with try/catch

[webb-nickj]

The use of try and catch to parse AJAX responses to JSON could currently mask errors in the callback function.

Would better if the callback was handled outside of try/catch:

var callbackData;
try{
    callbackData = JSON.parse( xhr.responseText );
}catch( e ){
    callbackData = xhr.repsonseText;
}

strictCallbacks ? callback(null, xhr, callbackData) : callback(xhr,callbackData);

[ajanderson1209]

Hey Nick, thanks for the bug information. The pull request is merged and should fix this issue. Thanks!