Suggestion

[Idomo]

Hi @gmarm,
First thing, thanks for building this library, it's great and exactly what I was needed!

I'd like to suggest few things to change, to make the library even better:

1. Make settings options more easier to understand
   In the beginning I thought there is no way to change it, but now I find out that I can change it via options property, it's not the most understandable way and I couldn't find any examples in the README.md or in the Example project, I think you should do something about it.

2. Remove layer.masksToBounds = true from line 310 when indicatorViewInset is negative
   When the indicatorViewInset is negative you should get nice effect like this:
   
   But instead of that the indicatorViewBackground is cutting of when it's passing the BetterSegmentedControl parent view because of this line.
   I don't see any problem after comment it out so it's just unnecessary.

I'v created pull request for this: #87

Thanks,
Ido.

[gmarm]

1. has been addressed by Segment protocol #78
2. I will be having a look at this and your PR since the implementation changed a bit there.