Exclude demo app from aggregated javadocs.

build.gradle

@@ -131,6 +131,9 @@ configure(rootProject) {
 		group = "Documentation"
 		description = "Generates aggregated Javadoc API documentation."
 		title = "${rootProject.description} ${version} API"
+
+		exclude 'org/springframework/credhub/demo/'
+
 		options.memberLevel = org.gradle.external.javadoc.JavadocMemberLevel.PROTECTED
 		options.author = true
 		options.header = rootProject.description