Updated RSpec, Rubocop, and cleaned up Gem setup
This MR does the following:
- Update Rubocop, its configuration file, and changed some code styles to adhere to the new Rubocop pedantry
- Nuke Gemfile.lock from Git as its not meant to be tracked for Gems
- Update RSpec to 3.0
- Added rspec-its since "its" is no longer part of RSpec itself
- Silence
git clone
output used for seeds as it made RSpec output unreadable