Add size option to gravatar_for method in UsersHelper (exercise 7.6.1)
Add tests for error messages on user creation failure
Add test to spec user creation page contents
Refactor flash code in application.html.erb
UGH ERB. Shifted application.html layout to Haml.
Merge branch 'exercises-8.6'
Missed a spot in Haml conversion; test caught it. Thanks, tests.