added user logic, added migration table to include access_token for user, moved history_getter logice to vendor directory
Merge branch 'master' of https://github.com/danisaurus/shift-api into features-active-user-logic
added active methods to user model and history_getter
fixed merge conflicts
revised params for user
Merge pull request #10 from danisaurus/features-active-user-logic

Features active user logic