PARC foundation libraries should sub out libev for libuv, to pave the way for windows support

[truedat101]

libuv is supported on windows, and is actively maintained by some very good core developers: https://github.com/libuv/libuv

Details on the issues with libev: http://stackoverflow.com/a/9947764/796514

Given Microsoft's big push into IoT, it's worth making sure all bases are covered.