travis.yml: Add Ruby 1.8.7 again
travis.yml: Add Ruby 1.8.7 again

mmoll/puppet-php,cgalvarez/puppet-php,netors/puppet-php,NickelMedia/puppet-php,cgalvarez/puppet-php,NickelMedia/puppet-php,glorpen/puppet-php,mmoll/puppet-php,netors/puppet-php,mayflower/puppet-php,mayflower/puppet-php,glorpen/puppet-php