Ldap3

- Moved to Bitbucket + Mercurial
- Fixed import in core.tls package
- Removed unneeded imports

- included missing extend package (thanks to debnet)

- when running in python 3.4 or newer now Tls class uses SSLContext object with default secure setting
- added parameters ca_certs_path, ca_certs_data, local_private_key_password to Tls object creation, valid when using SSLContext
- in python 3.4 or newer the system CA certificates configuration can be used (just leave ca_cert_file, ca_certs_path and ca_certs_data set to None)
- removed TLSv1 as default for Tls connection
- upgraded backported ssl function from python 3.4.1 when using with python 2
- when creating a connection the server parameter can be a string: the name of the server to connect in cleartext on default port 389
- fixed bug in ldap3.util.conv.escape_bytes()
- attributes parameter in search can be a tuple
- check_names parameter in connection now defaults to True (so when schema info is available attribute and class name will be checked when performing LDAP operations)
- remove the connection.close() method - use connection.unbind()
- new exception LDAPExtensionError for signalling when the requestValue of extended operation is of an unknown ASN1 type
- exiting connection manager doesn't raise an exception if unbind is not successful (needed in long operations)
- new extended operation: modify_password (RFC3062)
- new extended operation: who_am_i (RFC4532)
- new extended operation: get_bind_dn (Novell)
- updated setuptools to version 5.3

- Exception history in restartable strategy is printed when reached the maximum number of retries
- Fixed conditions on terminated_by_server unsolicited message
- Added python2.6 egg installation package

- Exception can now be imported from ldap3 package
- Escape_bytes return '' for empty string instead of None (thanks Brian)
- Added exception history to restartable connection (not for infinite retries)
- Fixed start_tls retrying in restartable connection (thanks Brian)
- New exception LDAPMaximumRetriesError for signalling when the SyncRestartable Strategy has reached the maximum number of retries while performing an operation
- Inverted deleteoldrdn value in LDIF output (thanks Joseph)

- Fixed a bug in LDIFProducer when using context manager for connection
- LDIF header in stream is added only whene there are actual data in the stream
- Now LDIF stream can be added to an existing file - version header will not be written if stream is not empty