copy dict properties by need in Saveable instead of copying everything and then deleting unneeded stuff
copy dict properties by need in Saveable instead of copying everything and then deleting unneeded stuff

mitchellstern/dynet,cherryc/dynet,cherryc/dynet,kamigaito/cnn,cherryc/dynet,Abasyoni/dynet,Peilun-Li/dynet,Peilun-Li/dynet,Abasyoni/dynet,Peilun-Li/dynet,kamigaito/cnn,Abasyoni/dynet,mitchellstern/dynet