Changed platform_family? to node['platform']
Changed platform_family? to node['platform']

platform_family? doesn't seem to work in an attributes file, it always entered
the windows path. With node['platform'] the code works as expected.

atomic-penguin/wordpress,brint/wordpress-cookbook,mconf-cookbooks/wordpress-cookbook,petracvv/wordpress-cookbook,brint/wordpress-cookbook,gsreynolds/wordpress-cookbook,mconf-cookbooks/wordpress-cookbook,brint/wordpress-cookbook,gusrc/wordpress-cookbook,petracvv/wordpress-cookbook,statlus/wordpress-cookbook,atomic-penguin/wordpress,gsreynolds/wordpress-cookbook,gusrc/wordpress-cookbook,statlus/wordpress-cookbook,gusrc/wordpress-cookbook,mconf-cookbooks/wordpress-cookbook,gsreynolds/wordpress-cookbook,petracvv/wordpress-cookbook