Add Asciidoctor configuration for AsciidoctorJ and AsciidoctorPDF.

Define global/master 'data-store-name' and 'data-store-version' documentation variables.

docs/spring-session-docs.gradle

@@ -21,6 +21,14 @@ def versions = dependencyManagement.managedVersions
 //def pathToSpringCss = new File(project.getBuildDir(), relativePathToSpringCss).getAbsolutePath()
 
 asciidoctor {
+	clearSources()
+	sources {
+		include "index.adoc"
+		include "guides/*.adoc"
+	}
+}
+
+asciidoctorj {
 
 	def ghTag = snapshotBuild ? 'master' : project.version
 	def ghUrl = "https://github.com/spring-projects/spring-session-data-geode/tree/$ghTag"
@@ -31,6 +39,8 @@ asciidoctor {
 		'docinfodir@': ".",
 		'highlightjsdir@': "js/highlight",
 //		'stylesheet' : pathToSpringCss,
+		'master-data-store-name' : 'Apache Geode',
+		'master-data-store-version' : '112',
 //		'spring-version' : "$springVersion",
 		'spring-version' : versions['org.springframework:spring-core'],
 		'spring-data-commons-version' : "$springDataCommonsVersion",
@@ -47,6 +57,14 @@ asciidoctor {
 		'version-release': releaseBuild
 }
 
+asciidoctorPdf {
+	clearSources()
+	sources {
+		include "index.adoc"
+//		include "guides/*.adoc"
+	}
+}
+
 javadoc {
 	configure(options) {
 		links = [