Net_SFTP::_list() only takes two parameters.
Merge pull request #422 from bantu/issue/419

Net_SFTP::_list() only takes two parameters.

* bantu/issue/419:
  Net_SFTP::_list() only takes two parameters.
Merge branch 'master' into php5

* master:
  Net_SFTP::_list() only takes two parameters.