Made CUDA choose device with most free memory by default
Made CUDA choose device with most free memory by default

Abasyoni/dynet,cherryc/dynet,Abasyoni/dynet,ndnlp/cnn,cherryc/dynet,echohenry2006/cnn,kamigaito/cnn,dhgarrette/cnn,zhangscth/cnn,mrzu/cnn,Abasyoni/dynet,dhgarrette/cnn,Peilun-Li/dynet,mitchellstern/dynet,yoavg/cnn,cherryc/dynet,Peilun-Li/dynet,kaishengyao/cnn,kaishengyao/cnn,Aureliu/cnn,mitchellstern/dynet,kamigaito/cnn,dhgarrette/cnn,Peilun-Li/dynet,yoavg/cnn,yanweifu/cnn