TwoBit reader written in C extension

[kojix2]

Hi, thanks for this awesome library!
I just wanted to let you know that I released bio-twobit yet another library to read 2bit files from ruby.

https://github.com/ruby-on-bioc/bio-twobit

This library is written in C extension and is expected to be fast. It may be used inside bioruby-ucsc-api if you like.

Feel free to create an issue on the project if anyone has feedback. Thanks!