Enhanced readability

Hi,

I've rewrite the replacement list to define one rule per line. This enhanced the readability a lot und allows a better compare (diff) for future changes via git/github.

I recommend to follow [PSR-0](http://www.php-fig.org/psr/psr-0/) and [PSR-1](http://www.php-fig.org/psr/psr-1/) for better integration in other frameworks. I also recommend to seperate the configuration from the logic to allow the use of custom written clients with your configuration.

If you welcome this recommendations I would be happy to help with PRs. I'm planning about implementing emoji into some projects but need these things done first. What do you think?