Added in 'auto' as an available value on margins
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.
tienhuynh/oocss,conymaniac/oocss,stubbornella/oocss,tannerhodges/oocss,eric-seekas/oocss,danielone/oocss,eaglesjava/oocss,laurenbenichou/oocss,eaglesjava/oocss,laurenbenichou/oocss,egoholic/oocss,danielone/oocss,Cartman0/oocss,egoholic/oocss,tienhuynh/oocss,eric-seekas/oocss,danielone/oocss,stubbornella/oocss,laurenbenichou/oocss,rishatsharafiev/oocss,eric-seekas/oocss,Cartman0/oocss,conymaniac/oocss,egoholic/oocss,eaglesjava/oocss,stubbornella/oocss,egoholic/oocss,tienhuynh/oocss,Cartman0/oocss,conymaniac/oocss,eric-seekas/oocss,rishatsharafiev/oocss,laurenbenichou/oocss,rishatsharafiev/oocss