Needs an install script

[jprice-da15252]

Since this tool was created to make things easier, installation should be equally easy. While the installation is only a few commands, those two commands could be one.

Some requirements:

• The installer should work on both MacOS and Ubuntu Linux
• The installer should work in a bash environment, but zsh compatibility will be needed before zsh support (#3) is complete
• The install script should detect if an alias for aps already exists in ~/.bash_profile, and only add the alias if it does not exist.
• It should create a ${HOME}/bin or some other subdirectory in the users and place the script there.
• It should detect or at least handle an upgrade scenario gracefully
  • To clarify, either detect and auto-upgrade or fail unless an upgrade argument is passed