added test for right shifting by a positive amount
added test for right shifting by a positive amount

laben/roast,cygx/roast,zostay/roast,dankogai/roast,bitrauser/roast,bitrauser/roast,niner/roast,laben/roast,zostay/roast,cygx/roast,niner/roast,b2gills/roast,cygx/roast,perl6/roast,b2gills/roast,skids/roast,zostay/roast,skids/roast,dankogai/roast,b2gills/roast,skids/roast,dogbert17/roast,laben/roast,dankogai/roast,niner/roast,dogbert17/roast