Update git author setup

This one was really forked!!!

The issue comes about from my previous
check of $(git config user.email).  It never succeeds since that file
isn't loaded into the current shell.  So I came up with the solution to
put a variable in the section that initially sets up the ${DOTFILES}
directory since that only runs on first install. Then check for this
variables existence assumes that there is no git author setup.  Feels
kludgy but until I can figure out a better one this will do.

Issue: #18
Update ViM Vundle installation

Put the quotes in the wrong place so it was trying to create a file
named "${HOME}/.vim/bundles.vim +PluginInstall +qall" for the entire
command instead of opening up ~/.vim/bundles.vim file and running the
commands.

Issue: #18
Update broken Inconsolata cask installation

Attempt to install the package as a brew command and it failed as its a
cask package.  Update the command to include the 'cask' prefix.

Issue: #20