Generate links controller with a basic index action.
Provide basic styling for links index page.
Implement edit and new actions for links controller.
Implement delete action for links.
Implement create and update actions for links.
Show small message if there are no links or groups.
Create targets constant in link model.
Validate link href with URI.regexp.
Merge pull request #22 from msrose/feature/links-controller

Feature/links controller