Rename modules {org.springframework.*=>spring-*}

This renaming more intuitively expresses the relationship between
subprojects and the JAR artifacts they produce.

Tracking history across these renames is possible, but it requires
use of the --follow flag to `git log`, for example

    $ git log spring-aop/src/main/java/org/springframework/aop/Advisor.java

will show history up until the renaming event, where

    $ git log --follow spring-aop/src/main/java/org/springframework/aop/Advisor.java

will show history for all changes to the file, before and after the
renaming.

See http://chrisbeams.com/git-diff-across-renamed-directories

spring-beans/src/test/java/com/foo/ComponentNamespaceHandler.java

@@ -0,0 +1,10 @@
+package com.foo;
+
+import org.springframework.beans.factory.xml.NamespaceHandlerSupport;
+
+public class ComponentNamespaceHandler extends NamespaceHandlerSupport {
+	public void init() {
+		registerBeanDefinitionParser("component",
+				new ComponentBeanDefinitionParser());
+	}
+}