[build] added ant website.open

this serves the site locally and opens your browser

buildScripts/info.ant.xml

@@ -258,6 +258,11 @@ build/website.
 'pack' bzips this up, ready to ship to the server.
 'publish' sends this to the server and runs a script to deploy.
 
+  > ant website.open
+  
+  First builds the website, then hosts it locally and opens it in your browser so
+  you can see the website in its full, template-applied form.
+
   > ant latest-changes.build
 
 Makes a changelog variant that lists only the newest changes; it is included

buildScripts/ivy.xml

@@ -58,6 +58,7 @@
 		<dependency org="projectlombok.org" name="markdownj" rev="1.02b4" conf="buildtools->build" />
 		<dependency org="de.java2html" name="java2html" rev="5.0" conf="buildtools->default" />
 		<dependency org="org.freemarker" name="freemarker" rev="2.3.28" conf="buildtools->default" />
+		<dependency org="com.sparkjava" name="spark-core" rev="2.9.2" conf="buildtools->default" />
 		
 		<dependency org="org.eclipse.jgit" name="org.eclipse.jgit.ant" rev="5.2.0.201812061821-r" conf="supporters->default" />
 		<dependency org="org.eclipse.jgit" name="org.eclipse.jgit" rev="5.2.0.201812061821-r" conf="supporters->default" />

buildScripts/website.ant.xml

@@ -150,6 +150,19 @@ such as applying the templates to produce the website, converting the changelog
 		<website.make version="${lombok.version.live}" fullversion="${lombok.fullversion.live}" cmd="all" />
 	</target>
 	
+	<target name="website.open" depends="website.build, compile.support" description="Builds the website, then serves it locally, opening a browser.">
+		<local name="dir.build.website" />
+		<property name="dir.build.website" location="build/website" />
+		<java classname="lombok.website.RunSite" failonerror="true">
+			<classpath>
+				<path refid="cp.buildtools" />
+				<pathelement location="build/support" />
+			</classpath>
+			<arg value="${dir.build.website}" />
+			<arg value="open" />
+		</java>
+	</target>
+	
 	<target name="website.print-all-versions" depends="compile.support">
 		<java classname="lombok.website.WebsiteMaker" failonerror="true">
 			<classpath>