Pod-fied project, replaced subclassing by categories, separated Sample from Library

Hi! Great work you have done here! I've been using and modifying RBStoryboardLink but the Containment approach has some drawbacks that are hard to let go.
Your approach is so simple, leaves no trace of other controllers on the view hierarchy.
I have made some changes I thought were improvements such as:
- Creating a podspec file to enable the library to be integrated by CocoaPods
- Removed the subclasses and used Categories of UIViewController and UINavigationController instead (it swizzles awakeFromNib, calling the original implementation and then loading the storyboardName, if any)
- Created separate Library and Sample folders

Your project does not state a license, I have added the MIT license, are you okay with this, or do you have other licensing terms in mind?
Please let me know if you want this merged, I would like to submit it to the CocoaPods master repo, you would only need to create an official tag and edit the podspec file to point to your original repo instead of my fork.
If not, please let me know if you authorize me to distribute these as MIT licensed or should I remove / rewrite my fork.

Best regards