Update postgres versions in puppet_modules

Fixes #245. The yum repo for postgres no longer contains the original
packages that the Vagrant VM referenced (via dependencies defined by
puppet). This updates them to use the 9.2.8 versions of lib, devel, and
server.

Signed-off-by: Michael Italia <ITALIAM@email.chop.edu>
Merge pull request #270 from cbmi/issue-245

Update postgres versions in puppet_modules