grids with box-sizing and gutters
Merge pull request #101 from stefsullrew/master

Request to add gutters to grids
Added in 'auto' as an available value on margins

.mha replaces having a class to center block-level elements in a container. The rest are added to make this a complete set.
.pop module doesn't look right, fix it
Merge pull request #137 from seansoong/fix-pop-module

.pop module doesn't look right, fix it
Removed the unnecessary declarations

margin-top:auto; and margin-bottom:auto are the same as margin-top:0; and margin-bottom:0;
Merge pull request #113 from mindofmicah/master

Adding "auto" to acceptable margin values
Merge pull request #1 from stubbornella/master

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