[71412882] fix issue with datepicker and turbolinks

callbacks for event `page:load` should be separated arguments
[pivotal story](https://www.pivotaltracker.com/s/projects/889184/stories/71412882)
Merge pull request #70 from bitzesty/71412882-datepicker-turbolinks-issue

[71412882] fix issue with datepicker and turbolinks
[71413370] store the user who completes a task

and include his/her name on the notification mail
[pivotal story](https://www.pivotaltracker.com/n/projects/889184/stories/71413370)
Merge pull request #71 from bitzesty/71413370-store-user-who-completes-task

[71413370] store the user who completes a task