Add attachment model
Fix attachment fixture, make title and url required
Add attachments on task edit/new pages
Fix attachments#index test
Delete Attachments, Add Attachments when creating new Tasks, Tests
Merge branch 'dev' into feature/attachments

Conflicts:
	app/assets/javascripts/tasks.js
	app/controllers/tasks_controller.rb
	app/views/tasks/_form.html.erb
	app/views/tasks/index.html.erb
	db/schema.rb
Merge branch 'dev' into feature/attachments

Conflicts:
	Gemfile
	Gemfile.lock
	app/controllers/tasks_controller.rb
	app/models/task.rb
	app/views/attachments/index.json.jbuilder
	app/views/tasks/_form.html.erb
	db/schema.rb
Merge pull request #1 from rs22/feature/attachments

Attachments for Tasks