Updated Support for 10.8.5 (Mail 6.6 [1510])

Hello jschroth -

Updated Support for 10.8.5 (Mail 6.6 [1510]) and incremented version to 3.5
Release bundle is here: https://app.box.com/s/5yo06qpgm299jp3k0hro

Cheers,
Jeeva

PS: I would like to contribute/carry a support for this plugin, please let me know your thoughts.