Merge pull request #615 from paulkaplan/sprite-info-updates

src/components/close-button/close-button.css

src/components/forms/input.css

src/components/gui/gui.css

src/components/library-item/library-item.css

src/components/sound-editor/sound-editor.css

src/components/sprite-info/icon--hide.svg

src/components/sprite-info/icon--show.svg

src/components/sprite-info/icon--x.svg

src/components/sprite-info/icon--y.svg

src/components/sprite-info/sprite-info.css

src/components/sprite-info/sprite-info.jsx

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

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

src/components/stage-selector/stage-selector.css

src/components/stage-selector/stage-selector.jsx

src/components/target-pane/target-pane.css

src/css/colors.css

src/css/units.css