Release 0.5.0

Changes

• Implemented SFTP statvfs and SFTP handle fstatvfs methods.
• Implemented SFTPStatVFS extension class for file system statistics.
• SFTP read and readdir functions now return size/error code along with data.
• SFTP handle fstat now returns attributes.
• Implemented SFTP handle readdir* methods as python generators.
• Block directions function renamed to match libssh2.
• Example scripts.
• All session authentication methods now raise AuthenticationError on failure.

Fixes

• SFTP readdir functions can now be used in non-blocking mode
• Use of SFTP openddir via context manager