Fix #253: Add proxy example
Fix #253: Add proxy example

thebeline/php-curl-class,zachborboa/php-curl-class,thebeline/php-curl-class,php-curl-class/php-curl-class,php-curl-class/php-curl-class,zachborboa/php-curl-class,zachborboa/php-curl-class,php-curl-class/php-curl-class