Added some automation for X OS setup

Taken from https://github.com/alecthegeek/brewFile
Merge pull request #34 from alecthegeek/patch-1

Added some automation for OS X setup.

Thanks @alecthegeek for the updates to make this easier.
updated Windows install process as well as fixed a link issue in README
Removed windows binaries. Closes #35
added MIT licence file and contributors
Corrected assertion about need for XCode and clarified support for OS X < Mavericks