Revert setting of CURLOPT_TIMEOUT
Revert setting of CURLOPT_TIMEOUT

PR 405 assigned the 'timeout' config setting to CURLOPT_TIMEOUT in
addition to CURLOPT_CONNECTTIMEOUT. This commit changes this so that a
new config setting of 'request_timeout' is used to setting
CURLOPT_TIMEOUT.

Closes #582

Tavy315/zendframework1,Tavy315/zendframework1