NAIROBI, May 28( Xinhua)--A three-day African coffee summit ended Friday evening in the Kenyan capital Nairobi with delegates pledging to upscale trade in the commodity across the continent. More than 500 delegates who attended the summit noted that intra-Africa trade in the commodity would boost growth in the continent, create new jobs and boost foreign exchange earnings. The delegates urged governments to facilitate and provide a supportive environment for trading in coffee through good polici