Nullability and Generics

[ZevEisenberg]

All the cool kids are using it.

[ateliercw]

If you add good nullability annotations, it shouldn't be bad to use as a framework with swift.

I'd rather see carthage support for making it more Swift friendly.

[ZevEisenberg]

Carthage support will be added in #32

[jvisenti]

@ZevEisenberg Second the request for nullability annotations. Specifically it's a problem because BonMot lets you pass in an optional string to BONChain (it's force unwrapped), but this will crash. This should be required nonnull because NSAttributedString crashes with a nil string.

But really more generally everything being force unwrapped (the default w/ no annotations) is very dangerous.