Merge pull request #3776 from benjiwheeler/menu-bar-messages

src/components/alerts/alert.jsx

src/components/alerts/alerts.jsx

src/components/alerts/inline-message.css

src/components/alerts/inline-message.jsx

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

src/components/spinner/spinner.css

src/components/spinner/spinner.jsx

src/containers/alert.jsx

src/containers/alerts.jsx

src/containers/inline-messages.jsx

src/css/colors.css

src/lib/alerts/index.jsx

src/lib/project-saver-hoc.jsx

src/reducers/alerts.js

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

test/unit/util/project-saver-hoc.test.jsx