Added node-gyp build system, and version bumped

[godsflaw]

I added the node-gyp build system for node >= 0.8.0 and version bumped so you can update in npm. Also, I updated the Readme.md with instructions for those on newer versions of node. Feel free to tweak as you see fit.

Tested on Mac, FreeBSD, and Linux. You may want to test on Windows too.

So far, runs good. Thanks for the hard work. :)

[godsflaw]

I should have also have noted that the current version does not compile correctly on 64 bit Mac as the old build system makes a 32bit Mach-o shared library. The solution was to upgrade to the new build system.

Cheers