Release 3.0

Fixed

• Lock releasing is a lot more robust now

Added

• Add idletime setting (thanks @Tieske), see session.cookie.idletime
• Add support for Cookie prefixes __Host- and __Secure- on Cookie
  name (see: https://tools.ietf.org/html/draft-ietf-httpbis-rfc6265bis-05#section-4.1.3)

Changed

• The whole codebase was refactored and simplified, especially implementing
  new storage adapters is now a lot easier
• Redis and Memcached spinlockwait was changed from microseconds to milliseconds and default
  is set to 150 milliseconds,
• Redis and Memcache will only release locks that current session instance holds
• DSHM session_dshm_store was renamed to session_dshm_region
• BASE64 encoding now strips the padding