v0.8.0

• Documentation (see docs directory)
• Minimum requirements shifted to PHP >= 5.5 and ZF >= 2.4 (tested up to 2.7)
• Introduced Introducing ListenerManager
• Introduced AbstractCollection for objects
• Added AbstractCriteria::hasId()
• UnderscoreSeparatedKeys enabled by default
• HasOneStrategy now uses the PrototypeStrategy for object creation
• Code improved
• [BC] Deprecate ServiceLocatorAwareInterface