Merge pull request #503 from kabel/4.0

A whole lot of 4.0
Remove wrapper shims from preview tool.
Create a bands styles file.
Throw away the leftovers.
Consistent positioning for the `grid12` row/column.
Remove extra line.
Merge pull request #504 from smeranda/old-grid

Remove forced wrapper in preview tool, stronger support for `.grid12`
Adjust breakpoints to workaround FF scrollbars.
Merge branch '4.0' of github.com:unl/wdntemplates into old-grid
Merge pull request #506 from smeranda/old-grid

Adjust breakpoints to workaround FF scrollbars.
Add support for padding un-banded content as low breakpoints
Add back the generic .clear CSS class to support markup clearing
Properly scope the .first selector to only apply to grids.

This is a common decoration class so we should ensure that it doesn't
collide with other uses.
Scope first in the proper order for cascade.