Add spring-build 2.2.3 and ensure build succeeds.

spring-build was previously included via an svn:external. Adding
directly to the source tree under Git to avoid the need for a git
submodule.

In order to build from any earlier commit, it is recommended to
export spring-build or symlink an existing copy into the root
of the spring-framework project and then build normally.

$ svn export https://src.springsource.org/svn/spring-build/tags/project-build-2.2.3 spring-build

spring-webflow-samples/booking-faces/pom.xml

@@ -155,8 +155,8 @@
 		<dependency>
 			<groupId>org.primefaces</groupId>
 			<artifactId>primefaces</artifactId>
-			<version>2.2.M1-SNAPSHOT</version>
-		</dependency>		
+			<version>2.2.1</version>
+		</dependency>
 		<!-- build time only dependencies -->
 		<dependency>
 			<groupId>javax.servlet</groupId>