CRM-14126 - Wrap use of CURLOPT_FOLLOWLOCATION in a check for open_basedir and safe_mode.

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* CRM-14126: HttpClient.php library used by CiviCRM issues a PHP warning when open_basedir is set
  http://issues.civicrm.org/jira/browse/CRM-14126
CRM-14126 - CRM_Extension - Add pleasant warning and log message if open_basedir/safe_mode prevents redirects.

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 * CRM-14126: HttpClient.php library used by CiviCRM issues a PHP warning when open_basedir is set
   http://issues.civicrm.org/jira/browse/CRM-14126
Merge pull request #2452 from totten/lolas-freeform-CRM-14126

 CRM-14126 - Wrap CURLOPT_FOLLOWLOCATION in a check for open_basedir and safe_mode