Add row zebra styling

[nathanpdaniel]

Adds row styling to allow alternating row colors. New props on Table or TableBody are zebra, evenRowColor, and oddRowColor.

To default alternating colors, simply add the zebra prop to Table or TableBody, or add evenRowColor with the desired color value (lightgray, #cccccc, red, etc.)

[dmk99]

Thanks for adding this feature!