tvOS support

[rmvz3]

I guess I will not be the last to ask for this. It seems that Apple made a few changes in the tvOS API. It would be great to have this library updated

[danoli3]

I'll have a go.

[ryangittings]

+1

[danoli3]

I have a working version... I'll clean it up and PR

[danoli3]

Main changes are: Since tvOS has no ability to save a NSData object to any location (no application support / or permanent storage location on tvOS), have to change this system to NSUserDefaults.

@Sam-Spencer keep this in mind for the Swift port, maybe a better idea to re-design into NSUserDefaults.

[danoli3]

@Sam-Spencer Do you have the PSD of the original large Icon with the spheres?