Adding eml2mbox.rb symlink

diff --git a/eml2mbox.rb b/eml2mbox.rb
new file mode 120000 (symlink)
index 0000000..d728931
--- /dev/null
+++ b/eml2mbox.rb
@@ -0,0 +1 @@
+eml2mbox/eml2mbox.rb
\ No newline at end of file