68108952 pagination of comments

- added ajax pagination of comments for ContentPlan, Content and User detail pages
- cleaned up UserController to use decent_exposure
68280686 Task deadlines implementation

- setup bootstrap-datepicker-rails
- added deadline field
- added displaying of deadline via tooltip
- added red color indication on overdue tasks
67642438 Content records order and filters

- set order fot content records as ref_no asc
- added ajax search filters for title, platfrom and status with pagination
- setup javascript testing via poltergeist
- covered ajax filtering of content records with Rspec tests
Merge pull request #54 from bitzesty/68108952-pagination-of-comments

68108952 pagination of comments
Merge pull request #56 from bitzesty/68280686-tasks-implemented-deadlines

68280686 Task deadlines implementation
Merge pull request #57 from bitzesty/67642438-content-records-filters

67642438 Content records order and filters
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