Added basic testing framework

This adds the basic boilerplate to test this module with:

    bundle install
    bundle exec rake spec

It also includes .travis stuff which integrates well with Github.

I also changed the install class from "package" to "install" and keyed off of `$::osfamily` instead of `$::operatingsystem` to conform to more standard module best practice stuff. (hope that is ok)

Closes #7.