Merge branch 'release/0.5.0' into develop
Re-enable PostgreSQL support.
Fixed rspec tests for defined types.

Added support for testing mysql::db and staging::deploy defined types.
Finalize puppetlabs/postgresql dependency version.
Add CHANGELOG generation to the Modulefile.

Stole the idea from
https://github.com/puppetlabs/puppetlabs-razor/commit/97e73df2fb2094daf5cba6f661ee09b5bf1a54a0
Update versions for 0.6.0 release.
Merge branch 'release/0.6.0'