Fix bugs in flex shorthand parsing. Based on: http://www.w3.org/TR/css3-flexbox/#flex-property
Sort client rectangle keys to better debug output values.
remainderSize should be greater than or equal to zero.
Return here if content alignment is stretch and lineRemainder is less than or equal to zero.
Updating testbed to take auto width/height values into account. Failing tests have increased from 37 -> 42, but now the testbed reports more accurate results.