Create MacViM installation

In hopes that I can install MacViM via Homebrew, create a test for the
path that prints from `xcode-select -p` to determine if xCode or Command
Line tools are installed, and then install the Homebrew version of ViM
if full installation is present.

Issue: #23
Update single quotes to double quotes

For code consistency, I traditionally use double quotes for string
interpolation and single quotes for punctuation.

Issue: #22