Ultimate fix (hopefully) for all the Mac setup issues
some modules (including git) require xcode command line tools, or otherwise they silently fail when installing. This release calls xcode-select --install to ask the user to install the command line tools in case they don't have it already installed.
If the command line tools are not installed, the first time install will fail, but once the user installs the xcode command line tools and try one more time, the installation should work.