Generate standard configuration meta-data

Update the `spring-boot`, `spring-boot-autoconfigure` and
`spring-boot-actuator` project to generate configuration meta-data
files during compilation.

See gh-1001

spring-boot/pom.xml

@@ -169,6 +169,12 @@
 			<artifactId>snakeyaml</artifactId>
 			<optional>true</optional>
 		</dependency>
+		<!-- Annotation processing -->
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-configuration-processor</artifactId>
+			<optional>true</optional>
+		</dependency>
 		<!-- Test -->
 		<dependency>
 			<groupId>org.apache.httpcomponents</groupId>