exclude spec/fixtures/** from puppet-syntax checking
add puppet 3.3.0 to travis test matrix
puppet-lint should ignore pkg/**
set stdlib requirement to 3.0.0
rm tests dir
doc update
support Gentoo as an $::osfamily

Instead of supporting it as an $::operatingsystem.  This may break
installations using old versions of facter but it's suspected that most Gentoo
installations will be using recent versions of puppet/facter.
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