Add javassist to external

We are going to add android-mock to external, which uses javassist.

Change-Id: Ibc17ea987c3a8cebb0a30e56d3574c3bacd589b2
diff --git a/regenerate_from_source.sh b/regenerate_from_source.sh
new file mode 100644
index 0000000..2f744e1
--- /dev/null
+++ b/regenerate_from_source.sh
@@ -0,0 +1,14 @@
+#!/bin/bash
+#
+# Copyright (C) 2011 The Android Open Source Project.
+# This script imports the src, test, etc. from javassist. It DOESN'T commit
+# to git giving you a chance to review the changes. Remember that changes in
+# bin are normally ignored by git, but we need to force them this case.
+#
+# This script doesn't take any parameter.
+
+svn export --force http://anonsvn.jboss.org/repos/javassist/trunk .
+rm lib/junit.jar
+# I don't check if there is something on lib on purpose; that way, if
+# anything new is added, we will get a visible error.
+rmdir lib