conditionally do not manage the postgres server itself, so users can separately declare postgresql::server and pass whatever options they want.
remove duplicated documentation of puppetdb::database::postgresql manage_firewall parameter
fix module description in NOTICE
Merge pull request #121 from jantman/conditional_db

Parameter to not manage postgresql server
Auto enable strict_variables for unit tests when puppet > 3.5
Merge pull request #129 from mcanevet/feature/enable_strict_variables

Auto enable strict_variables for unit tests when puppet > 3.5