68191444 Order of content plans

- set order as ref_no asc for all displayings of content plans
- did small clean up of code - corrected some controllers to use decent_exposure
70425858 display assigned tasks in user's profile

https://www.pivotaltracker.com/story/show/70425858

- added displaying of assigned tasks on user's profile page
- covered profile page with Rspec tests
Merge pull request #58 from bitzesty/68191444-content-plans-ordering

68191444 Order of content plans
Merge pull request #59 from bitzesty/70425858-user-profile-add-assigned-tasks

70425858 display assigned tasks in user's profile
70426360 task completion notification

    - added Task mailer
    - added Tasks::Complete interactor
    - covered with Rspec tests