Support load from nib.

Hi there, FSQCollectionViewAlignedLayout was wonderful. But it doesn't work in my project. I create my views and FSQCollectionViewAlignedLayout object in storyboard. I found `collectionView:cellForItemAtIndexPath:` never called. After some investigation, FSQCollectionViewAlignedLayout not setup defaults when load from a nib.

This pull request will fix this. And also add some storyboard inspect support.