Renamed the cookie and location functions

Renamed the cookie and location functions and added this to the documentation.

WSDL Cache and extra options

Added the WSDL cache option and the possibility to add extra options to the SoapClient.

SoapHeader

Added SoapHeaders and a better documentation.

Update Service.php #4

Merge pull request #4 from orecrush/patch-1

Update Service.php

Add the trace option

Add the trace option

Fixed issue#1

Fixed: https://github.com/artisaninweb/laravel-soap/issues/1