Integrate with css-tables spec

[zcorpan]

https://quirks.spec.whatwg.org/#the-percentage-height-calculation-quirk
https://quirks.spec.whatwg.org/#the-table-cell-width-calculation-quirk
https://quirks.spec.whatwg.org/#the-table-cell-nowrap-minimum-width-calculation-quirk

Should specify the table quirks in terms of https://drafts.csswg.org/css-tables/ (does it define how percentage heights for table cells are calculated now?)

cc @gregwhitworth @FremyCompany

[gregwhitworth]

We have a very rough draft in there regarding this. I wouldn't say it's ready for referencing quite yet, but it's getting there.