Add link to github in rendered docs

Guardfile

@@ -2,10 +2,10 @@ require 'asciidoctor'
 require 'erb'
 require './src/main/ruby/readme.rb'
 
-options = {:mkdirs => true, :safe => :unsafe, :attributes => 'linkcss'}
+options = {:mkdirs => true, :safe => :unsafe, :attributes => ['linkcss', 'allow-uri-read']}
 
 guard 'shell' do
-  watch(/^src\/[A-Za-z].*\.adoc$/) {|m|
+  watch(/^src\/[A-Z-a-z][^#]*\.adoc$/) {|m|
     SpringCloud::Build.render_file('src/main/asciidoc/README.adoc', :to_file => './README.adoc')
     Asciidoctor.render_file('src/main/asciidoc/spring-cloud-bus.adoc', options.merge(:to_dir => 'target/generated-docs'))
   }

docs/src/main/asciidoc/spring-cloud-bus.adoc

@@ -1,8 +1,13 @@
 = Spring Cloud Bus
+:github: https://github.com/spring-cloud/spring-cloud-config
+:githubmaster: {github}/tree/master
+:docslink: {githubmaster}/docs/src/main/asciidoc
 :toc:
 
 include::intro.adoc[]
 
+include::https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/master/docs/src/main/asciidoc/contributing-docs.adoc[]
+
 == Quick Start
 
 include::quickstart.adoc[]