Include documentation samples in the main docs zip

Previously, to see an example of the documentation that can be
produced by Spring REST Docs, users had to clone the repository and
build one of the samples.

This commit makes it easier to see what Spring REST Docs can do by
updating the docs zip that's automatically published to docs.spring.io
to include both the API Guide and the Getting Started Guide from the
RESTful notes sample.

Closes gh-112

build.gradle

@@ -153,7 +153,7 @@ task api (type: Javadoc) {
 	}
 }
 
-task docsZip(type: Zip, dependsOn: [':docs:asciidoctor', ':api']) {
+task docsZip(type: Zip, dependsOn: [':docs:asciidoctor', ':api', ':buildSamples']) {
 	group = 'Distribution'
 	baseName = 'spring-restdocs'
 	classifier = 'docs'
@@ -167,6 +167,10 @@ task docsZip(type: Zip, dependsOn: [':docs:asciidoctor', ':api']) {
 	from(api) {
 		into 'api'
 	}
+
+	from(file('samples/rest-notes-spring-hateoas/build/asciidoc/html5')) {
+		into 'samples/restful-notes'
+	}
 }
 
 configurations {