v4.4.1-beta.4

• Cleanup Buttons CSS (background-color, background-image)
• Improve icons in buttons (Material-icons or Fontawesome or SVG)
• Updated documentation
• Updated dependencies

4.4.1 - beta 3 (unreleased)

• New One-line and two-line lists (see Material > Lists documentation)
• New Line ripple for forms/inputs (see Material > Text fields documentation)
• Desactivate _waves.scss for button ripples integration
• Improved documentation