Implementing Go benchmarks

Just a couple of notes:

1. The GOPATH env variable should be set up as the go benchmarks depend on a matrix library (https://github.com/skelterjohn/go.matrix) before a `go get github.com/skelterjohn/go.matrix` happens
2. Not sure if the Mandel number was correct, each language seemed to have its own expected result.
3. We didn't implement the randmatstat function

Big thanks to @jayschwa!