Add Mac support?

[aaclarker]

Is there any opposition to officially adding Mac (darwin) support to the Makefile?

I am able to get it working just by changing the GOOS variable to darwin.

[earthboundkid]

The makefile isn't really needed. Just run go get github.com/adhocteam/certwatcher and you're good to go. It will put the binary in ~/go/bin unless you change your GOPATH or GOBIN environment variables.