Fixed issue with adagrad and scale parameter
Fixed issue with adagrad and scale parameter


Former-commit-id: 17d5b029436e9c9a1aa5ca54a1fe6ae7be714f6b
clab/cnn,clab/dynet,chunyang-wen/dynet,xunzhang/dynet,shuheik/dynet,shuheik/dynet,chunyang-wen/dynet,danielhers/dynet,clab/dynet,xunzhang/dynet,danielhers/dynet,chunyang-wen/dynet,clab/dynet,clab/dynet,clab/dynet,danielhers/dynet,shuheik/dynet,danielhers/dynet,xunzhang/dynet,shuheik/dynet,shuheik/dynet,danielhers/dynet,chunyang-wen/dynet,danielhers/dynet,clab/dynet,clab/cnn,danielhers/dynet,clab/cnn,shuheik/dynet,shuheik/dynet,clab/dynet,xunzhang/dynet