add line to redefne Bcrypt cost factor in test environment
define a gravatar_for helper method
Add code for a pretty debug box, including a Sass mixin.
add some debug information to site layout (shows only in test env)
add sidebar to reader show view
add SCSS for styling reader show page, including sidebar element
create and author form for signing up new users
create and author partial for displaying form submission error messages
add CSS for styling error messages
add contents of flash variable to site layout
Finish reader signup