macOS support

Hi, I modified the the default font name on macOS so that the default font is now found without errors.

Also I modified the install location from /usr/ to /usr/local/. Now it is possible to create a formula for Homebrew. I will update the README.md to illustrate the installation process on macOS once that the formula will be accepted to the Homebrew repository.

Please do a new release as this is a precondition to accept the formula.