Clean up comments regarding the displaying of tasks on the project page
- Make Task a subresource of Project.
- UI for adding new task from the projects page.
Merge branch 'master' of https://github.com/moexmen/okr

Conflicts:
	app/controllers/tasks_controller.rb
	app/views/projects/show.html.slim
	app/views/tasks/show.html.slim
	config/routes.rb