tutorial section 5.1.2 - added bootstrap + intro to sass
tutorial section 5.1.2 - finished
tutorial section 5.1.3 - (using partials) finished
tutorial section 5.2 - (sass basics applied) finished
tutorial section 5.3 - finished (excl. silly code duplication inside rspec)
tutorial section 5.5 - finished layout and routes + sign-up first step