[tlu] new beta

[Adam R. Maxwell]

I've finally released a new beta that uses a more robust way to check TeX Live versions (motivated by the bug in the first release of TL 2015), and also to allow users a quick way to change preferences for El Crapitan.

https://github.com/amaxwell/tlutility/releases

This is minimally tested, but works for me. Any further testing would be great; I've had no time for TeX stuff lately.

-- 
adam