Removes strict comparison

Currently, the following example would not show any event.
```js
$('#calendar').fullCalendar({
  defaultView: 'resourceDay',
  // Note that we are using Int values to define the ids.
  resources: [{'id':0,'name':'Resource 1'},{'id':1, 'name':'Resource 2'}], 
  events: [
  {
    title: 'R1-R2: Lunch 14.00-15.00',
    start: '2013-08-21T14:00:00.000Z',
    end: '2013-08-21T15:00:00.000Z',
    // Different type for the ids here: String.
    resources: ['0','1'] 
  }
});
```

This pull request allows the showed example to work by removing the strictness of types when associating resources and events.