add libtorrent fetch script

get_libtorrent.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+#
+# This script checks out libtorrent from subversion
+#
+
+SVN=$(which svn)
+LT_URL=https://libtorrent.svn.sourceforge.net/svnroot/libtorrent
+VERSION=14
+[ "$1" != "" ] && VERSION=$1
+BRANCH=branches/RC_0_$VERSION
+
+if [ -d libtorrent ]; then
+	$SVN up libtorrent
+else
+	$SVN co $LT_URL/$BRANCH libtorrent
+fi