I just wrote a blog post on getting a development environment setup on OSX utilizing Docker and Dinghy (boot2docker clone). This solves the vboxfs slow file mounting issues as well as the complex install of M2.
It appears everything installed, this was in the final phase of the setup process (grunt refresh). Bring up your web instance with `docker-compose up -d web`, then go into the machine `docker exec -it CONTAINER_ID bash`, and try running `grunt refresh` again.
If that doesn't work, it could perhaps be a bug with generating static resources. I've ran into this randomly, it could be an issue with dinghy/docker but I'm not sure, but once i turned on developer mode in .htaccess file the errors stopped going away.