Prepare for RAC conversion
Use a signal to enable/disable the done button
RACify user sign up sequence
Add validation & error checking
Use command to power done button
Use signals to follow changes to the post's text
RACify submission of a new post
Use command to power Post save button
Use signal to enable/disable log-in button
RACify log-in
RACify log-in form validation
Use command to power log in button