feat(components): add sidebar, color story

src/sidebar/Sidebar.js

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+import Sidebar from 'semantic-ui-react/dist/commonjs/collections/Sidebar'
+export default Sidebar

src/stories/palette.stories.js

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+import React from 'react'
+import { storiesOf } from '@kadira/storybook'
+import { withKnobs } from '@kadira/storybook-addon-knobs'
+import Button from '../button/Button'
+
+const stories = storiesOf('core.Palette', module)
+
+.addDecorator(withKnobs)
+.add('colors', () => (
+  <div>
+    <Button color='red'>Red</Button>
+    <Button color='orange'>Orange</Button>
+    <Button color='yellow'>Yellow</Button>
+    <Button color='olive'>Olive</Button>
+    <Button color='green'>Green</Button>
+    <Button color='teal'>Teal</Button>
+    <Button color='blue'>Blue</Button>
+    <Button color='violet'>Violet</Button>
+    <Button color='purple'>Purple</Button>
+    <Button color='pink'>Pink</Button>
+    <Button color='brown'>Brown</Button>
+    <Button color='grey'>Grey</Button>
+    <Button color='black'>Black</Button>
+  </div>
+))
+
+export default stories