Align puppet manifests with recommended style guide

Running [puppet-lint](http://puppet-lint.com) reported 106 errors and warnings all together. This pull request fixes 103 of them, leaving following 3:

    puppet/modules/wordpress/manifests/init.pp - WARNING: line has more than 80 characters on line 8
    puppet/modules/wordpress/manifests/init.pp - WARNING: line has more than 80 characters on line 13
    puppet/modules/wordpress/manifests/init.pp - WARNING: line has more than 80 characters on line 37

Additionally [the official style guide](http://docs.puppetlabs.com/guides/style_guide.html) is respected as much as possible.