Remove useless .col-*-offset-12 and .col-xs-offset-0 classes

Created by: ghost

Your grid system has .col-*-offset-* from 0 to 12 but we need only from 1 to 11.

.col-xs-offset-0 = useless .col-xs-1 + .col-xs-offset-12 is = 13 = bug

This example is correct:

From	To
.col-*-1	.col-*-12	12
.col-*-offset-1	.col-*-offset-11	11