Pysmb

========================
- SharedFile instances returned from the listPath() method now has a new
file_id attribute which represents the file reference number given by the SMB server.

========================
- Remove support for SMB-2.1 dialect as it seems to have issues with Windows 2008 R2

========================
- Prevents OperationError from being raised when listPath() operation does not
return any matching file results.
- SMBConnection is now a context manager 122.

========================
- Fix buggy support for search parameter in listPath() method. Add
SMB_FILE_ATTRIBUTE_INCL_NORMAL bit constant to include 'normal' files with
other file types in the returned result. From now on, pysmb defines a 'normal' file
as a file entry that is not read-only, not hidden, not system, not archive and
not a directory; it ignores other attributes like compression, indexed, sparse,
temporary and encryption. listPath() method will now include 'normal' files
using the default search parameter.
- Add isNormal property to SharedFile class to support test if the file is a
'normal' file (according to pysmb definition of 'normal' file).

========================
- Improve listPath implementation for SMB1
- Support for STATUS_PENDING responses across all SMB2 operations.

========================
- Fix bug in listShares() method which fails when the remote server has many shares.
- Improve echo() method to test and fail if the provided data to echo is not a bytes object.
- Fix bug in listPath() method where the path to query is not properly terminated.