add image for travis in readme
add image for travis in readme

mihaic/brainiak,mihaic/brainiak,yidawang/brainiak,IntelPNI/brainiak,CameronTEllis/brainiak,IntelPNI/brainiak,yidawang/brainiak,brainiak/brainiak,TuKo/brainiak,lcnature/brainiak,brainiak/brainiak,mihaic/brainiak,TuKo/brainiak,CameronTEllis/brainiak,yidawang/brainiak,lcnature/brainiak,brainiak/brainiak,TuKo/brainiak,IntelPNI/brainiak,CameronTEllis/brainiak,lcnature/brainiak