Normalise naming of more Sass partials

See 457b1496.

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Bring in various styles with require directive

We reserve `@import` for pure-Sass (non-erb) partials. See 240c7eeb.

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Use default.css stylesheet for Protractor, LSG

As Sprockets directives are ignored by the Gulp sass plugin, b6d5c298
should obviate the need for a separate 'meta' stylesheet.

This partially reverts 271aeef434ebb31e57284606a87fced974768e16.

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Move .nomenus padding rules out of legacy styles

Signed-off-by: Alex Coles <alex@alexbcoles.com>