v2.3.0

Docs

• #123: Update Anchor.js dependency.

CSS

• #127: New custom <select> styling.
• #129: Fix counter styles in buttons.
• #132: Redesign input error and warning tooltip styles.
• #133: Add new .text-center utility class.
• #137: Ensure transparent .child-avatars render on top of other avatars.

Tooling

• #128: Move from grunt-autoprefixer to grunt-postcss.