adding cifar100 download script in linux

this is the linux version of cifar100 download script !

data/cifar100/get_cifar100.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env sh
+# This scripts downloads the CIFAR100 (binary version) data and unzips it.
+# After executing this script, and files being extracted, you need to head to 
+# examples/cifar100 and then execute create_cifar100 
+DIR="$( cd "$(dirname "$0")" ; pwd -P )"
+cd $DIR
+
+echo "Downloading..."
+
+wget --no-check-certificate http://www.cs.toronto.edu/~kriz/cifar-100-binary.tar.gz
+
+echo "Unzipping..."
+
+tar -xf cifar-100-binary.tar.gz && rm -f cifar-100-binary.tar.gz
+
+# Creation is split out because leveldb sometimes causes segfault
+# and needs to be re-created.
+
+echo "Done."