Testing of Dependency Checks and Installation

Running `surfergems --install` checks for and installs the following packages for osx:

`homebrew`
`bash` >v4
`git`
`grep` gnu version
`coreutils` gnu utils
`java` >v8
`zenity`
`parallel`
`freesurfer` v6 + patch

Does `surfergems-install` work on any mac system? What errors do new users encounter?
