v4

• Rewritten core for less code duplication
• No longer merges returned style object, but returns arrays instead, which should work with common CSS-in-JS libraries
• space function has been rewritten with the core style and compose utilities
• Adds long-form props for margin and padding (e.g. marginTop). Shorthand aliases still work as before.
• Reintroduces the alias argument to style utility
• Removes the styles object export
• Removes the util object export
• Removes merge utility
• Removes the mixed utility since it did not behave as expected
• The theme "scale" is now passed as the second argument to the transformValue option in style utility
• Removes the ratio style function
• The following changes to the borders style function
  • The shorthand border props no longer transform numbers to pixel widths with a solid border-style
  • Adds borderWidth, borderStyle, borderColor, and borderRadius props
  • All border props are also available as individual imports
• Removes styleType from prop types meta fields
• Changes to the get utility: now returns the last argument as a fallback