Don't include the pgdg recipes on the wrong machine types

Don't bother including enable_pgdg_apt on rhel, and don't include
enable_pgdg_yum on Debian.
Update repo key location
Merge pull request #180 from bai-cookbooks/update-key

Update repo key location
CentOS 7 support
Add missing dir /etc/sysconfig/pgsl that's missing when using centos 7
Merge pull request #178 from schrodinger/pgdg_ubuntu

Don't include the pgdg recipes on the wrong machine types
Merge pull request #182 from stephenlauck/sysconfig_dir_centos_70

Add missing dir /etc/sysconfig/pgsl that's missing when using centos 7
Merge pull request #183 from webvit/platforms

CentOS 7 support
posgresql cookbook version 3.6.6
Merge pull request #184 from hw-cookbooks/develop

Release 3.6.6
Check to make sure mem is less than con, set work_mem to 1 otherwise.
maintainer information clean up.
Merge pull request #187 from hw-cookbooks/maintainer

maintainer information clean up.
Merge pull request #188 from hw-cookbooks/work_mem

Check to make sure mem is less than con, set work_mem to 1 otherwise.
add centos 7 platform
Merge pull request #189 from hw-cookbooks/kitchen-centos7

add centos 7 platform
exclude centos 7 from apt related suites
Merge pull request #190 from hw-cookbooks/kitchen-centos7

exclude centos 7 from apt related suites
update release version and changelog
Merge pull request #191 from hw-cookbooks/develop

postgresql cookbook version 3.4.8