ENH: grep stdin using the special filename '-'.
ENH: grep stdin using the special filename '-'.

git-svn-id: 228151c6c098cf6fb629a8cadc3a43437d5f10bd@25 b5260ef8-a2c4-4e91-82fd-f242746c304a

LuizCentenaro/grin,mindw/grin,while0pass/grin,lecheel/grin,cpcloud/grin