Added shell script to get data files from website.

get-data-files.sh

@@ -0,0 +1,28 @@
+#!/bin/sh
+
+URL="http://programmingcomputervision.com/downloads/pcv_data.zip"
+
+if /usr/bin/env wget $URL
+    then
+
+    mkdir data-unpack.tmp
+    cd data-unpack.tmp
+
+    unzip -q ../pcv_data.zip
+    rm -rf __MACOSX
+
+    cd ..
+
+    if [ -d data/ ]
+        then
+        echo Directory 'pcv-data' already exists.
+        echo Look in the data-unpack.tmp directory for the unzipped data.
+    else
+        mv data-unpack.tmp/data .
+        rmdir data-unpack.tmp
+    fi
+
+    rm pcv_data.zip
+else
+    echo Could not get data archive. Check URL and make sure you have wget.
+fi