Fix shift() mixin to return proper values when nested
Fix shift() mixin to return proper values when nested

setie/neat,thoughtbot/neat,smithdamen/neat,bgreg/neat,thoughtbot/neat,craftsmen/neat,thoughtbot/neat,craftsmen/neat,bahtiyara/neat,craftsmen/neat,Martskin/neat,jessieay/neat,2metres/neat,greyhwndz/neat,kennethormandy/straight-up,nickg33/neat,chriseppstein/neat