fix representation as numpy arrays to work in the column-major rep of Eigen.
fix representation as numpy arrays to work in the column-major rep of Eigen.


Former-commit-id: 15f85016c05be14bdfdcf936bad847c22e40ef85
xunzhang/dynet,shuheik/dynet,shuheik/dynet,shuheik/dynet,clab/dynet,shuheik/dynet,danielhers/dynet,danielhers/dynet,danielhers/dynet,xunzhang/dynet,danielhers/dynet,chunyang-wen/dynet,chunyang-wen/dynet,clab/dynet,chunyang-wen/dynet,clab/dynet,shuheik/dynet,danielhers/dynet,xunzhang/dynet,danielhers/dynet,chunyang-wen/dynet,clab/dynet,clab/dynet,clab/dynet,clab/cnn,shuheik/dynet,xunzhang/dynet,danielhers/dynet,clab/dynet,clab/cnn,clab/cnn,shuheik/dynet