Upgraded prop-deps plugin

build.gradle

@@ -3,7 +3,7 @@ buildscript {
 		maven { url 'http://repo.springsource.org/plugins-release' }
 	}
 	dependencies {
-		classpath 'org.springframework.build.gradle:propdeps-plugin:0.0.4'
+		classpath 'org.springframework.build.gradle:propdeps-plugin:0.0.6'
 		classpath 'org.springframework.build.gradle:docbook-reference-plugin:0.2.7'
 	}
 }