All offset columns are generated as "g-offset1"

[nicbell]

It looks like all offsets are being generated as g-offset1.
The bug is on line 121 of _choreographic-grid.scs
.g-row > .g-offset1 { the '1' should be dynamic.

This is the current output.

    .g-row > .g-offset1 {
        margin-left: 0.03157895%;
    }

    .g-row > .g-offset1:first-child {
        margin-left: 10.03157895;
    }

    .g-row > .g-offset1 {
        margin-left: 0.14736842%;
    }

    .g-row > .g-offset1:first-child {
        margin-left: 20.14736842;
    }

[mrmartineau]

This has bee resolved in your PR.