add vim modeline
add vim modeline

geugon/learntris,TylerLau/learntris,nbgraham/learntris,LearnProgramming/learntris,DTSCode/learntris-haskell,Shamash2014/spice_and_html,Shamash2014/spice_and_html,bschaef14/learntris,SultansDream/testris,Shamash2014/spice_and_html,WhitmanH/learntris,lochanaeg/learntris,bschaef14/learntris,Larsharaldjoh/Tetris,BigRoss/learntris,BigRoss/learntris,mosegontar/learntris,tangentstorm/learntris,bschaef14/learntris,TylerLau/learntris