allow user-defined units/spaces

[joechrz]

eg: to be able to create multiple decorators within the same cell (but without dealing with pixels)

use case: have a calendar widget implemented with the grid, one col = 1 day, 1 row = half hour. want to be able to render double-booked events side-by-side using decorators

[scamden]

couldn't you handle this use case by creating a decorator for the cell, and then simply rendering the two events within the decorator? just let them each take up half the space?

def interesting to hear more what you mean by user defined spaces tho, i'll add for v4 discussion