change span size used in front page tables
edit user link on profile page is now a button
split up link_to edit user path onto two lines
update README
remove app/views/users/edit.html.erb - devise view used instead
refactor user model presence validations
refactor user model validations
add validation for presence of encrypted_password in user model
refactor validations
refactor association validations for chores, add null constraints for validates_presence_of fields