Test: Make sure that relative pathing more than one level deep works.

[mrjoelkemp]

From: dependents/Dependents#103

As an example.  Drill down from the sass root, main file of my repo
(framework/scss/sitestyle.scss), to the 'base/base-theme then to 'layouts'
then to 'layout/page' (works),  but try going back (dependents) from any of
those files and it will only work from 'base-theme'.
https://github.com/dkebler/hugo-quickstart-site/blob/master/framework/scss/sitestyle.scss

Just for grins I put a 'test' dependency in the /base/layout/_page.scss
file that looks up one directory '../_test.scss'.  That works but
surprisingly from that file base/_test.scss it finds the _page.scss
dependent one subdirectory down!  This is an usual construction despite
working.