Fix alignment and indentation
Use the lambda method for multi-line lambdas
Favor modifier if usage given a single-line body
Prefer single-quoted strings

We don't need string interpolation or special symbols.
Remove redundant `self.` from article repository
Remove extra empty line detected at class body end
Use fail instead of raise to signal exceptions
Use %r for regexp matching more than 1 '/' char
Allow `bin/scss-lint` to not be snake case
Add Rubocop rake task