Allow merging Service Manager configuration
Allow merging Service Manager configuration

- Allows specifying a "service_manager" key in module / application
  configuration
- Configuration provided by a module is merged with internal
  services configuration
- During loadModules.post, all merged service configuration is then used
  to configure the ServiceManager
  - Thus, modules and/or application configuration can override
    services! EXCEPT for services in the default configuration...

MadCat34/zend-servicemanager,weierophinney/zend-servicemanager,matwright/zend-servicemanager,akrabat/zend-servicemanager,prolic/zend-servicemanager