OSX build

[dbalabka]

I have found that Hearth works on OSX just great:

It would be good to have executable for Mac. It might be automated using Travis:
https://docs.travis-ci.com/user/reference/osx/

[aheart]

Thanks for testing on OSX @torinaki !
We can use this template https://github.com/japaric/trust to build for Windows, Linux and OSX and publish artifacts.