[IMRPOVED] Overall improvements to cookbook tests

* Added bootstrap script to install gems via bundler
* Updated Gemfile and Gemfile.lock
* Added rubocop tests and configuration
* Updated all files to pass rubocop tests

Still needs work to run properly again.
[REVERT] Removed mysql ref in Berksfile
[FIX] Allow fetching gems online
[FIX] Rubocop error on Rakefile
Merge pull request #32 from TheSerapher/improvements

Improvements