Create install script

Basic install script, taken from @necolas
<https://github.com/necolas/dotfiles/blob/master/bin/dotfiles>, will
setup environmental conf file based on $OSTYPE.  Create all necessary
directories. Check all dependencies (xcode, homebrew, git, pip) are
loaded, if not install them. Download the repository and initialize
if necessary.

- Create help text (-h | --help)
- Create man page (man install)
- Create setup script to generate conf files and create directories
- Update .gitignore for generated conf files for installation
- Update @necolas utils library to include more necessary methods

Issue: #1