Added missing functions in nodes-common.cc
Added missing functions in nodes-common.cc

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