Updates

Added some gem dependencies (rspec, bundler, rspec-its, and rubocop). Moved dependencies from Gemfile to gemspec. Used rspec-its and rubocop to clean up the tests a bit. Changed tabs to spaces, double-quotes to singles, and a number of other formatting changes (in keeping with [The Ruby Style Guide](https://github.com/bbatsov/ruby-style-guide)). Made tests pass by changing old "commonHack" objects and file references to "HackOne" objects and updating a few methods in `lib/hack_one.rb`. Cleaned the cleanse method up a bit.