Add shell script that gets the job done.

update_exercism.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+exercism fetch
+cd `exercism debug | grep "Exercises Directory" | cut -d: -f2`
+
+for D in *; do
+  if [ -d "${D}" ] ; then
+    cd ${D} 
+
+    new=$(ls -tr|tail -n 1)
+    if [ ${new} != "current" ] ; then
+      if [ -f current ] ; then
+        rm current
+      fi
+      ln -s ${new} current
+    fi
+    cd ..
+  fi
+done