Merge branch 'develop' into e16n

package.json

src/components/cards/card.css

src/components/cards/cards.jsx

src/components/gui/gui.jsx

src/components/library/library.css

src/components/library/library.jsx

src/components/spinner/spinner.css

src/components/spinner/spinner.jsx

src/containers/backdrop-library.jsx

src/containers/blocks.jsx

src/containers/cards.jsx

src/containers/gui.jsx

src/containers/stage-selector.jsx

src/containers/tips-library.jsx

src/lib/default-project/09dc888b0b7df19f70d81588ae73420e.svg

src/lib/default-project/3696356a03a8d938318876a593572843.svg

src/lib/default-project/b7853f557e4426412e64bb3da6531a99.svg

src/lib/default-project/e6ddc55a6ddd9cc9d84fe0b4c21e016f.svg

src/lib/default-project/index.js

test/helpers/selenium-helper.js