Registry Autoloading

HiveMind 1.x was able to load all "META-INF/hivemodule.xml" files automatically.
The concept of autolading was broadened and made more extensible.
The RegistryBuilder now has a method autoDetectModules.
It tries to detect so called RegistryProviders by searching the classpath for a global manifest entry "hivemind-providers".

Example of MANIFEST.MF:

Manifest-Version: 1.0
hivemind-providers: org.apache.hivemind.impl.HivemoduleProvider

An instance of the specified class (multiple classes can be specified, separated by comma) is created and the registry definition
is passed via the RegistryProvider interface:

public interface RegistryProvider
{
    public void process(RegistryDefinition registryDefinition, ErrorHandler errorHandler);
}

For example the HivemoduleProvider loads all hivemodule.xml files.
It just delegates the work to a XmlModuleReader:

public void process(RegistryDefinition registryDefinition, ErrorHandler errorHandler)
{
   XmlModuleReader xmlModuleReader = new XmlModuleReader(registryDefinition);
   xmlModuleReader.readClassPathModules("META-INF/hivemodules.xml");
}