Move params::{user,group} to be set under osfamily

Allows for OS specific $user and $group value specification. For most of
the target operating systems these will both be 'postgres'. For FreeBSD
however these values are 'pgsql'.
Update FreeBSD $confdir to defer to $datadir

This matches the behaviour of most of the other operating systems
configurations.
Change validate_postgresql_connection.sh exec PATH

FreeBSD needs /usr/local/bin in PATH in order to find bash. This does
require that the node has the bash port installed. It might be desired
that a separate script was provided for FreeBSD which used its /bin/sh,
this could be done by changing the for loop in the script to use

    for c in $(jot $TRIES)

in place of

    for (( c=1; c<=$TRIES; c++ ))
Replace psql_db => $user with $default_database.

On FreeBSD systems the $user variable is not 'postgres' so does not
match the default database correctly. These changes use the existing
default_database parameter to replace instances where $user is passed as
the database to be connected to.

These changes are in server::database, server::role and
server::grant.
Merge pull request #391 from geoffgarside/freebsd

Fix FreeBSD support
Fix unit tests with rspec-puppet 1.0
Merge pull request #393 from mcanevet/dev/rspec_puppet_1_0

Fix unit tests with rspec-puppet 1.0
Allow the ex- and import of postgresql::server::db
Fixed travis by updating Gemfile to pin Rake to 10.1.1

The latest Rake update requires Ruby >= 1.9. This update
fixes the failing 1.8.7 tests by pinning Rake to the last
supported version on ruby 1.8.7.

This patch is borrowed from @blkperl
Merge pull request #398 from igalic/rake

Fixed travis by updating Gemfile to pin Rake to 10.1.1
Merge pull request #397 from pieterlexis/exported_db

Allow the ex- and import of postgresql::server::db
Fix postgresql_conf quote logic

Things like IP addresses DO need to be in quotes. Fixing regex to reflect
requirement.
Add tests

The test sets an ip address, uses language to indicate it should end up
in quotes.