Enforcing double quoted string literals
Fixing hashes not following #:rocket: syntax
Exclude vendor directory and clean up console script

* vendor directory is used by Travis and rubocop would try and check everything
* console script includes a rubocop:disable comment flag for binding.pry
The rubocop violation todo list

Pick a problem from .rubocop_todo.yml, verify the expected syntax with the
GitHub styleguide and add rule to .rubocop.yml if required and removed from the
list as fixed.