Merge branch 'develop' of github.com:LLK/scratch-gui into feature/tags

.travis.yml

package.json

src/components/monitor-list/monitor-list.css

src/components/monitor-list/monitor-list.jsx

src/components/monitor/list-monitor-scroller.jsx

src/components/monitor/list-monitor.jsx

src/components/monitor/monitor.css

src/components/monitor/monitor.jsx

src/components/stage/stage.jsx

src/containers/monitor.jsx

src/containers/stage.jsx

src/lib/libraries/backdrops.json

src/lib/libraries/costumes.json

src/lib/libraries/sprites.json