* Add first pass + demo of updated SummaryNumber
* Add new larger screen breakpoint
* Remove the max-width from the content wrapper
* Update previous label text
* Fix the border colors/sizing
* Create a mixin to generate the grid template pattern
* Add green/red colors based on trend, with prop to reverse
In some cases, a downward trend is good (ex, refunds), so we want to be able to color those green
* Move selected number containers up to avoid the double-border
* Document className logic, and apply 10-item layout to all cases of 10+ items
* Remove layout notes
* Update component docs, clean up optional displays
* Update style of SummaryNumbers inside cards
* Filter out any `false` or otherwise unrenderable children
* Fix card borders
* Update dashboard component to use new props
* Check that prevValue is defined
a prevValue of 0 was incorrectly outputting `0` for both label and value
* Update no-change datapoint style
* Update default data values
Rather than hiding the prevValue/label or delta section if these are not passed through, use default N/A placeholders
* Change SummaryList & SummaryNumber to a list of links
Add active, hover, and focus styles
* Add a short help text for screen reader users
* Add href to README
* Add the href prop to the readme example
* Fix border colors
The `nth-of-type` rules need to be on the `li` containers
* Fix font-weights on value & delta
* Wrap the previous label/value when the percentage wraps
* Adds SCSS color variables and breakpoint mixins
* Use webpack to pull in shared CSS
* Move notices reset rule to wpadmin-reset
* Prefix breakpoints, colors, and wpadmin reset
Kelly Dwan
Justin Shreve