Merge pull request #68 from nealcpeters/links

Links
fix controllers to add destroy, add ajax to delete on subchapters
Merge branch 'master' of https://github.com/nealcpeters/infobytes into tutorial_page
Merge pull request #69 from nealcpeters/tutorial_page

Tutorial page
chapter deletion is working now
fixed minor merge conflicts in chapters_controller
Merge pull request #70 from nealcpeters/tutorial_show

Tutorial show
responsive styling on tutorial and topic navigation
Merge branch 'master' into links