Make starter actually work and update README.md

Updated README.md with working, but not finished, install directions.
Added .gitignore to not store the osxc.* roles from galaxy and .DS_Store cruft.
Made default behavior for a single-user install with ansible.cfg's roles_path = ./roles
Updated configuration.yml and install.yml to handle osxc.* role names.
Fixed small issue with requirements.yml using repository instead of osxc.repository.