Refactor specs to resemble new RSpec.describe syntax

[jmuheim]

Before:

require 'rails_helper'

describe UsersController do
  describe 'routing' do
    it 'routes to #index' do
      expect(get('/users')).to route_to('users#index')
    end

Now:

require "rails_helper"

RSpec.describe BoilerplatesController, type: :routing do
  describe "routing" do

    it "routes to #index" do
      expect(:get => "/boilerplates").to route_to("boilerplates#index")
    end