INT-3147: (3167,3173,1941) Improve MetadataStore

Previously, `MetadataStore` couldn't be configured for Twitter Adapters
- only a global one could be used.
The `metadataKey` was generated automatically with a 'difficult' value.

* Register all `MessageSource` for `SourcePollingChannelAdapter`
as beans with id based on adapter id and prefix '.source' (INT-3147)
* Polishing parser to get rid of explicit `MessageSource` beans. (INT-3147)
* Make Feed and Twitter adapters `id` attribute as required -
now it presents a `metadataKey` for `MetadataStore` (INT-3147)
* Add to Twitter adapters a reference attribute for `MetadataStore` (INT-3173)
* Add Twitter adapters `poll-skip-period` attribute (INT-3167)
* Add and implement `MetadataStore#remove` (INT-1941)
* Make `MetadataStore` as `@ManagedResource` (INT-1941)
* Polishing tests

JIRAs:
https://jira.springsource.org/browse/INT-3147
https://jira.springsource.org/browse/INT-3167
https://jira.springsource.org/browse/INT-3173
https://jira.springsource.org/browse/INT-1941

INT-3147: Polishing and fixes

* add domain suffix to `metadataKey`
* change contract of `MetadataStore.remove`
* remove timeout window from `AbstractTwitterMessageSource`
* polishing and fix `SearchReceivingMessageSourceWithRedisTests`

INT-3147: Rebasing and polishing

INT-3147: fix 'metadata' package tangle

INT-3147 Doc Polishing

spring-integration-file/src/main/java/org/springframework/integration/file/config/FileInboundChannelAdapterParser.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2013 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,9 +16,10 @@
 
 package org.springframework.integration.file.config;
 
+import org.w3c.dom.Element;
+
 import org.springframework.beans.BeanMetadataElement;
 import org.springframework.beans.factory.config.BeanDefinition;
-import org.springframework.beans.factory.config.RuntimeBeanReference;
 import org.springframework.beans.factory.support.BeanDefinitionBuilder;
 import org.springframework.beans.factory.support.BeanDefinitionReaderUtils;
 import org.springframework.beans.factory.xml.ParserContext;
@@ -27,7 +28,6 @@ import org.springframework.integration.config.xml.IntegrationNamespaceUtils;
 import org.springframework.integration.file.locking.NioFileLocker;
 import org.springframework.util.StringUtils;
 import org.springframework.util.xml.DomUtils;
-import org.w3c.dom.Element;
 
 /**
  * Parser for the <inbound-channel-adapter> element of the 'file' namespace.
@@ -53,9 +53,8 @@ public class FileInboundChannelAdapterParser extends AbstractPollingInboundChann
 			builder.addPropertyReference("locker", lockerBeanName);
 		}
 		builder.addPropertyReference("filter", filterBeanName);
-		String beanName = BeanDefinitionReaderUtils.registerWithGeneratedName(
-				builder.getBeanDefinition(), parserContext.getRegistry());
-		return new RuntimeBeanReference(beanName);
+
+		return builder.getBeanDefinition();
 	}
 
 	private String registerLocker(Element element, ParserContext parserContext) {