(maint) Add major platforms for PE testing

As an stop-gap measure we need to scale our testing into EC2; this
commits adds Cent 5 adn 6, Rhel 5 and 6, ubunt 10.04 and 12.04,
Debian 6 and SLES 11.
Merge pull request #393 from djm68/add_pe_ami

(maint) Add major platforms for PE testing