Done some tasks.
Add bootstrap gem.
Install bootstrap generator.
Apply bootstrap to tasks views.
Reinstall simple form with --bootstrap option.
* app/views/tasks/show.html.haml: add state machine label's
Fix tasks views style.
Apply bootstrap generator to users views.
Add comments for tasks form.
Embed comments behavior into tasks view.
Merge branch 'feature/bootstrap' into develop

* feature/bootstrap:
  Embed comments behavior into tasks view.
  Add comments for tasks form.
  Apply bootstrap generator to users views.
  Fix tasks views style.
  * app/views/tasks/show.html.haml: add state machine label's
  Reinstall simple form with --bootstrap option.
  Apply bootstrap to tasks views.
  Install bootstrap generator.
  Add bootstrap gem.