Add CURLOPT_SSL_VERIFYPEER option

Hi there, 

I've been trying to get integrated and found the issue. It seems that I can only get the client to work when adding the following option to curl config

CURLOPT_SSL_VERIFYPEER => false,

I'm using PHP 5.4.45-1~dotdeb+6.1 (cli) (built: Sep  4 2015 23:33:03) 

Could you please add this option to the class?

Thanks

