v0.2.3

Regrouped almost all different forks into this one, added some enhancements of my own, changed module name and uploaded stable version to pypi.

Includes:

• Allow dot (and perhaps other characters) in username
• connector: remove duplicate SIMPLE and SYNC imports
• services: update user's DB entry from LDAP (if needed)
• Search for LDAP entry by both username and e-mail + large refactor
• support of alternative LDAP ciphersuites
• Fixed UTF-8 encoded DN
• update notes
• Completion of support of alternative LDAP ciphersuites
• LDAP over START TLS
• New error message if several matches on login