Remove SSLv3 protocol support

This is a reworked version of a PR from tas50 against open source
which was made more urgent by the publication of the poodle exploit
https://github.com/opscode/omnibus-chef-server/pull/41

Conflicts:
	files/private-chef-cookbooks/private-chef/attributes/default.rb
Update changelog & release notes with POODLE changes
attributes are in the private_chef namespace, not chef_server
Update ssl cipher list
Merge pull request #553 from opscode/jm/poodle_1.4-stable

Jm/poodle 1.4 stable