Added shell script to download the SVHN dataset
Added shell script to download the SVHN dataset

[chg] Added ./pylearn2/scripts/datasets/download_svhn.sh script
      for SVHN dataset download to the $PYLEARN2_DATA_PATH/SVHN/format2 directory.
      The script is closely based on download_cifar10.sh, but it uses a verbose wget
      or curl.

matrogers/pylearn2,matrogers/pylearn2,matrogers/pylearn2,matrogers/pylearn2