[Dev] new mirrors

[Kartick Suriamoorthy]

We have two new mirrors !! OS Savant and Union Station got their rsync
working yesterday night and have started publishing ZipTie builds on
their respective websites.

I have updated the links on our website to point to those mirrors. I 
modified the stable_build page on ziptie.org such that ziptie.org is
at the end of the table (to point more traffic to the mirrors).

http://www.ziptie.org/stable_build

Thanks,
Kartick Suriamoorthy

ZipTie Community Manager
http://www.ziptie.org/