Color Updates!

Updates

• Update color palette, fix button renders
• Add global helper function for color string checking, update button group colors
• Update Components to use updated colors, update color docs
• Added all new EUI colors and updated styles in Docs, including redesigned sidebar

Bugfix

• Clear ripple timeout on ComponentWillUnmount

Breaking Changes

• theme.color.primary & theme.color.secondary are no longer supported. Apps will need updating accordingly. All other legacy theme colors are still mapped to their new values.