users can add tasks to a task list
refactored login method in feature specs
implemented validations
fixed description on a spec
users can complete tasks
tasks appear in order of their due date
show default message if there are no incomplete tasks
Merge branch 'tasks-complete' of https://github.com/gSchool/rails-practice-task-lists
updated stories and wireframes
Merge branch 'tasks-complete' of https://github.com/gSchool/rails-practice-task-lists
Implemented working filter button for users