Merge branch 'develop' into nj/ui-changes

.travis.yml

package.json

src/components/blocks/blocks.css

src/components/menu-bar/menu-bar.jsx

src/containers/blocks.jsx

src/containers/costume-tab.jsx

src/css/z-index.css

src/lib/cloud-manager-hoc.jsx

src/lib/file-uploader.js

src/lib/make-toolbox-xml.js

src/playground/player.css

src/playground/player.jsx

src/reducers/mode.js

test/helpers/selenium-helper.js

test/integration/blocks.test.js

test/integration/examples.test.js

test/integration/localization.test.js

test/integration/project-loading.test.js

test/unit/reducers/mode-reducer.test.js