added download/unpack scripts

scripts/download-url.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+# Usage: ./download.sh https://www.a.url/to/download filename_for_downloaded.file
+# Usage: ./download.sh https://www.a.url/to/download filename_for_downloaded.file a_username a_password
+URL=$1
+FILENAME=$2
+
+if [ "$#" -gt 2 ]; then
+    USERNAME=$3
+    PASSWORD=$4
+    curl -L -o "${FILENAME}" -u "${USERNAME}:${PASSWORD}" ${URL}
+else
+    curl -L -o "${FILENAME}" ${URL}
+fi