Show HN: Polyfill for random_bytes() and random_int() in PHP 5 projects

When PHP 7 is released later this year, PHP users will finally be able to quickly and easily leverage a CSPRNG in their projects.

    random_bytes(int) - Generate a string of random bytes from the OS (e.g.. /dev/urandom)
    
    random_int(int, int) - Generate an unbiased random integer between two integers

We wrote this library so PHP 5.x users can import this in their project and write code that takes advantage of this new PHP 7 API. Particularly random_int(), which is suitable for random string generation (e.g. random password generator).

We cannot declare the 1.0.0 stable release until the PHP team makes a design decision about how to handle errors in their version of the library. We currently throw an Exception; they might decide to return false and raise an E_WARNING error. Until the outcome is known, we're in limbo.

This library has not been subject to a paid audit by a security team, but it has been reviewed by several prominent members of the PHP community (and a few security/crypto folks outside of PHP land).

I believe it to be more secure than any other PHP implementation of these features. That said, more review and scrutiny would be greatly appreciated! :)