Merge pull request #14 from aczietlow/php-oop

Php oop
Merge pull request #15 from aczietlow/php-oop

Php oop
Merge pull request #16 from aczietlow/php-oop

Php oop
Merge pull request #17 from aczietlow/php-oop

Updating examples for blog post.
Merge pull request #18 from aczietlow/php-oop

Adding new closure example.
Merge branch 'master' of github.com:aczietlow/php-sandbox into php-oop