Merge pull request #1468 from fsih/blockDrag

package.json

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

src/components/sprite-selector/sprite-selector.css

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

src/components/target-pane/target-pane.jsx

src/containers/sprite-selector-item.jsx

src/containers/target-pane.jsx

src/lib/vm-listener-hoc.jsx

src/reducers/block-drag.js

src/reducers/gui.js

src/reducers/hovered-target.js

...mponents/__snapshots__/sprite-selector-item.test.jsx.snap

test/unit/containers/sprite-selector-item.test.jsx