2.0.0-beta1

• Dropped Symfony < 2.7 support.
• Dropped PHP < 5.5 support.
• Exclude tests from autoloader.
• Allow to use POST for logout.
• Fix UserPassword constraint validation groups.
• Harmonized email detection in UserManager.
• Added unique index for confirmation_token field.
• Added Kyrgyz translation files.
• Added user manipulator events.
• Replaced checkPostAuth by checkPreAuth in AuthenticationListener.
• [BC break] Method ResettingController::getObfuscatedEmail has been removed.
• [BC break] Renamed templates to underscore case.
• [BC break] Removed UserManager::refreshUser.
• [BC break] Removed UserManager::loadUserByUsername.
• [BC break] Removed UserManager::supportsClass.
• [BC break] Removed unused properties expired and credentialsExpired including corresponding methods.
• [BC break] The signature of the Initializer constructor has changed.
• [BC break] The signature of the LoginManager constructor has changed.
• [BC break] The signature of the UserListener constructor has changed.
• [BC break] The signature of the UserManager constructor has changed.
• [BC break] The translation key resetting.request.invalid_username has been removed.
• [BC break] The propel dependency was dropped.
• [BC break] The salt field of the User class is now nullable.