update Rakefile boilerplate

Rakefile

@@ -2,12 +2,12 @@ require 'puppetlabs_spec_helper/rake_tasks'
 require 'puppet-syntax/tasks/puppet-syntax'
 require 'puppet-lint/tasks/puppet-lint'
 
-PuppetLint.configuration.send("disable_class_inherits_from_params_class")
-PuppetLint.configuration.ignore_paths = [
-  'pkg/**/*.pp',
-  'spec/**/*.pp',
-  'tests/**/*.pp',
-]
+PuppetSyntax.exclude_paths = ['spec/fixtures/**/*']
+
+PuppetLint::RakeTask.new :lint do |config|
+  config.pattern          = 'manifests/**/*.pp'
+  config.fail_on_warnings = true
+end
 
 task :default => [
   :syntax,