Merge branch 'develop' into greenkeeper/scratch-l10n-3.1.20190123150639

package.json

src/components/meter/meter.css

src/components/meter/meter.jsx

src/components/sprite-selector/sprite-list.jsx

src/containers/sprite-selector-item.jsx

src/containers/stage-selector.jsx

src/containers/watermark.jsx

src/lib/backpack/sprite-payload.js

src/lib/throttled-property-hoc.jsx

src/lib/vm-listener-hoc.jsx

src/reducers/targets.js

test/unit/util/throttled-property-hoc.test.jsx

test/unit/util/vm-listener-hoc.test.jsx