green tests for sign-up
WIP
Login tests green
update login/signup error handling
add tests for login
add migration for child sti in users table
create sti relationship for parent and child
create models for parent and child
add name assignment functionality
rename parent and child model to adopt new pirate theme
  parents are now captains
  children are now pirates
adjust associations to reflect models' renaming
add captains controller
add pirates controller
resolve conflict with view
resolved conflict to remove unneeded files
modify captains and sessions controller to adopt
renaming of user to captain
rename variables in views to adopt renaming of
user to captain
update routes to reflect renaming of user
to captain
Integration tests green
add .travis.yml for travis.ci
add .travis.yml for travis.ci