add At.js and dependencies

apps/comments/js/vendor/Caret.js/LICENSE-MIT

apps/comments/js/vendor/Caret.js/README.md

apps/comments/js/vendor/Caret.js/bower.json

apps/comments/js/vendor/Caret.js/component.json

apps/comments/js/vendor/Caret.js/dist/jquery.caret.js

apps/comments/js/vendor/Caret.js/dist/jquery.caret.min.js

apps/comments/js/vendor/Caret.js/package.json

apps/comments/js/vendor/Caret.js/src/jquery.caret.coffee

apps/comments/js/vendor/Caret.js/src/jquery.caret.js

apps/comments/js/vendor/jquery/.bower.json

apps/comments/js/vendor/jquery/AUTHORS.txt

apps/comments/js/vendor/jquery/LICENSE.txt

apps/comments/js/vendor/jquery/README.md

apps/comments/js/vendor/jquery/bower.json

apps/comments/js/vendor/jquery/dist/core.js

apps/comments/js/vendor/jquery/dist/jquery.js

apps/comments/js/vendor/jquery/dist/jquery.min.js

apps/comments/js/vendor/jquery/dist/jquery.min.map

apps/comments/js/vendor/jquery/dist/jquery.slim.js

apps/comments/js/vendor/jquery/dist/jquery.slim.min.js