slacker has secure password
add bcrypt-ruby gem to project
add strong parameters to slacker model
migration: add name column to slackers table
add shoulda-matchers to project
validate presence of necessary slacker data
test for secure password in slackers
validate email addresses in slackers model
bugfix: security risk in regexp, replaced ^ with \A and $ w \z, see http://guides.rubyonrails.org/security.html#regular-expressions for explanation