initial commit
added users controller and route for sign_in
user schemas added to db
initial views, assets, and helpers
user model with email regex validation and test suite for adding user to DB
added email uniqueness
added secure password
tests for json input, added rack-test gem, added controller functionality
added tests for password mismatch, incorrect password, and for success. also implemented these things
Merge branch 'master' of https://github.com/pvmoura/authentication_api
added documentation