Moved a media-query rule for .subnavbar-inner to the max-width: 979 area instead of max-width: 767 area.

Because the .subnavbar-inner was being blanked out for the btn-navbar (the "hamburger" menu in top right), but the .subnavbar-inner was still there.  This way it goes away when it is blanked out.
Merge pull request #186 from thebouv/master

Moved a media-query rule for .subnavbar-inner