Added lightbox

sass/materialize.scss

sass/style.scss

static/theme/lightbox2/.gitignore

static/theme/lightbox2/.jscsrc

static/theme/lightbox2/.jshintrc

static/theme/lightbox2/CONTRIBUTING.md

static/theme/lightbox2/Gruntfile.js

static/theme/lightbox2/LICENSE

static/theme/lightbox2/README.md

static/theme/lightbox2/bower.json

static/theme/lightbox2/dist/css/lightbox.css

static/theme/lightbox2/dist/css/lightbox.min.css

static/theme/lightbox2/dist/images/close.png

static/theme/lightbox2/dist/images/loading.gif

static/theme/lightbox2/dist/images/next.png

static/theme/lightbox2/dist/images/prev.png

static/theme/lightbox2/dist/js/lightbox-plus-jquery.js

static/theme/lightbox2/dist/js/lightbox-plus-jquery.min.js

static/theme/lightbox2/dist/js/lightbox-plus-jquery.min.map

static/theme/lightbox2/dist/js/lightbox.js