[bitauth] Bumping to version 0.3.1

[xcthulhu]

BitAuth now had unicode support!

With this revision I will be updating my wrapper accordingly.

[xcthulhu]

Okay, I have been working on this, it appears that BitAuth 0.3.1 broke Closure support by switching how it was using browserify.

This was breaking CLJSJS and my own ClojureScript wrapper further downstream. I believe that my latest commit bitpay/bitauth#56 restores CLJSJS and my wrapper, but it's not 100% clear. The javascript code being wrapped is output by browserify which is complicated and unpredictable.

I will wait for BitPay to pull my commit in, and make another pull request when I can confirm using ClojureScript testing that the latest version of bitauth is functioning properly with clojurescript.

[xcthulhu]

I can confirm that this version has been tested with my UTF-8 branch of my clj-bitauth project and this is 100% compatible with my JVM implementation.

Here is my branch that I am referring to: https://github.com/xcthulhu/clj-bitauth/tree/utf-8

[Deraen]

I won't accept PR which adds the source code to the repo.