The previous version of liquid grid would not take margins into proper
account. With this patch the margins are a correct percentage of the
container, and adding multiple margins / columns together should add up
to just about 100% (not entirely accurate, but very close).
The math is as follows:
With the previous version, you get these numbers:
4.173% grid width * 24 columns = 100.152%, which due to rounding 'fixes'
in the template becomes exactly 100%. However, this is without any margins.
Once you add margins, you exceed 100%, rendering margins unusable. To add
to the confusion, the margins are not a percentage of the width, but instead
in 'em' units, making it very difficult to keep the entire grid from getting
beyond 100% in width once you add margins.
With this patch, you get these numbers:
(3.167% grid width + 1.042% margin) * 24 columns = 101.1016%. Since you
don't use any margin for the last column, you subtract one margin and end up
with 99.974%. Optimally this number would be 100.000%, but the 0.026% error
is difficult to remove, and an acceptable compromise in my opinion.
In summary, this patch enables margins to be used with the liquid grid,
which is the expected behaviour.
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