PHP-880: Add Support for UPDATE Write API command
Skip on 5.2, stream_context_create only takes 1 argument
PHP-880: Add Support for DELETE Write API command
WS as per PR review
Merge pull request #586 from bjori/PHP-880-update-cmd

PHP-880: Add Support for UPDATE&DELETE Write API command

* bjori/PHP-880-update-cmd:
  WS as per PR review
  PHP-880: Add Support for DELETE Write API command
  Skip on 5.2, stream_context_create only takes 1 argument
  PHP-880: Add Support for UPDATE Write API command