New pods: OpenSSL and CHMath

So a while back I tried making a pod for CHMath. It didn't go so well ( https://github.com/CocoaPods/Specs/pull/51 ). To make it work for iOS, and just in general package it more prettilly, I packaged OpenSSL. I started out with https://github.com/bindle/iOSPorts/issues/4 , but that was a dead end and I ended up doing it from scratch instead.

CHMath also has a tag now.