fix NewRelicInteractor::addCustomParameter
Updated the README
Merge pull request #23 from magnusnordlander/master

Updated README
Merge pull request #22 from gido/fix-custom-parameter

fix NewRelicInteractor::addCustomParameter
Allows to omit application_name to keep the previously set one

For example if the value is set in php.ini, apaches conf, nginx, or php-fpm