added authentication tests to todo

updated todo API documentation

updated todo tests

removed user field from required fields

began reworking todo routes to be nested under user

re-added bcrypt with synchronous hash instead async

fixed test issues by removing bcrypt from test suite

added user ref to todo

fixed some user controller bugs and finished user tests

fixed bug with user list method, more progress on user tests

added bluebird and began user tests

finished auth integration tests

added sinon, began writing auth tests

hooked up user routes

added user route