Integrate io.spring.convention.docs plugin

Closes gh-107

build.gradle

@@ -17,6 +17,8 @@ apply plugin: 'io.spring.convention.root'
 group = 'org.springframework.security.experimental'
 description = 'Spring Authorization Server'
 
+ext.snapshotBuild = version.contains("SNAPSHOT")
+
 repositories {
 	mavenCentral()
 }

docs/manual/spring-security-oauth2-authorization-server-docs-manual.gradle

@@ -0,0 +1,33 @@
+apply plugin: 'io.spring.convention.docs'
+apply plugin: 'io.spring.convention.springdependencymangement'
+apply plugin: 'io.spring.convention.dependency-set'
+apply plugin: 'io.spring.convention.repository'
+apply plugin: 'java'
+
+asciidoctor {
+	attributes([stylesheet: 'css/style.css'])
+	resources {
+		from(sourceDir) {
+			include "css/**"
+		}
+	}
+}
+
+asciidoctorj {
+	def ghTag = snapshotBuild ? 'master' : project.version
+	def ghUrl = "https://github.com/spring-projects-experimental/spring-authorization-server/tree/$ghTag"
+	attributes 'spring-authorization-server-version' : project.version,
+		'spring-boot-version' : springBootVersion,
+		revnumber : project.version,
+		'gh-url': ghUrl,
+		'gh-samples-url': "$ghUrl/samples"
+	attributeProvider resolvedVersions(project.configurations.testCompile)
+}
+
+def resolvedVersions(Configuration configuration) {
+	return {
+		configuration.resolvedConfiguration
+			.resolvedArtifacts
+			.collectEntries { [(it.name + "-version"): it.moduleVersion.id.version] }
+	}
+}