CSS watcher

Run with bin/make_css_watch

This watches the .scss files in web/cobrands/* and runs the appropriate
sass/compass commands (as per bin/make_css) on just those directories
with changed files.

As a special case, a change to the partials in web/cobrands/sass will
cause a rebuild of all cobrands.
Merge branch 'css-watcher'
Don't mark Swedish title for translation.