Add a update.sh to download, update and install dependencies in the src dir

update.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+if [ -e "SleekXMPP" ]
+then
+    echo "Updating SleekXMPP"
+    cd SleekXMPP
+    git pull
+    cd ..
+else
+    echo "Downloading SleekXMPP"
+    git clone git://github.com/louiz/SleekXMPP.git
+fi
+if [ -e "dnspython" ]
+then
+    echo "Updating dnspython"
+    cd dnspython
+    hg pull -u
+    cd ..
+else
+    echo "Downloading dnspython"
+    hg clone http://hg.louiz.org/dnspython
+fi
+
+if [ ! -e "src/dns" ]
+then
+    echo "Creating link src/dns"
+    ln -s src/dns dnspython/dns
+fi
+if [ ! -e "src/sleekxmpp" ]
+then
+    echo "Creating link src/sleekxmpp"
+    ln -s src/sleekxmpp SleekXMPP/sleekxmpp
+fi