Feature Request: clientHeight, offsetHeight and scrollHeight #221
Description
We use this library extensively, and it is extremely useful, but it would be useful to be able to access both the height that a SizeMe-wrapped container takes up (its clientHeight and offsetHeight, depending on the inclusion of the scrollbar and border) and the size that the contents of the container take up (the scrollHeight). I think this can be accessed by the use of two separate SizeMes around a parent container set to represent the clientHeight and a child container styled so that its height matches the scrollHeight but that doesn't seem ideal for performance reasons.