Fixed SSHFS setup.
Fixed configuration options for rbenv VM installs.
Added the [Readline](http://tiswww.case.edu/php/chet/readline/rltop.html) Homebrew install.

* Currently locked at Readline 6.2.4 per this [rbenv issue](https://github.com/sstephenson/ruby-build/issues/550).
Added Homebrew bin folder to PATH for Homebrew install.