Add shellscript for optimization.

core/img/image-optimization.sh

+#!/bin/bash
+
+function recursive_optimize_images() {
+cd $1;
+optipng -o6 *.png;
+jpegoptim --strip-all *.jpg;
+for svg in `ls *.svg`;
+do
+    mv $svg $svg.opttmp;
+    scour -i $svg.opttmp -o $svg --create-groups --enable-id-stripping --enable-comment-stripping --shorten-ids --remove-metadata;
+done;
+rm *.opttmp
+for dir in `ls -d */`;
+do
+    recursive_optimize_images $dir;
+    cd ..;
+done;
+}
+
+recursive_optimize_images ../../