Sync docs from v2.1.0.M4 to gh-pages

spring-cloud-stream/2.1.0.M4/Guardfile

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+require 'asciidoctor'
+require 'erb'
+
+guard 'shell' do
+	watch(/.*\.adoc$/) {|m|
+		Asciidoctor.render_file('index.adoc', \
+			:in_place => true, \
+			:safe => Asciidoctor::SafeMode::UNSAFE, \
+			:attributes=> { \
+				'source-highlighter' => 'prettify', \
+				'icons' => 'font', \
+				'linkcss'=> 'true', \
+				'copycss' => 'true', \
+				'doctype' => 'book'})
+	}
+end
+
+guard 'livereload' do
+	watch(%r{^.+\.(css|js|html)$})
+end

spring-cloud-stream/2.1.0.M4/index-docinfo.xml

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+<productname>Spring Cloud Stream</productname>
+<releaseinfo>{spring-cloud-stream-version}</releaseinfo>
+<copyright>
+	<year>2013-2018</year>
+	<holder>Pivotal Software, Inc.</holder>
+</copyright>
+<legalnotice>
+	<para>
+		Copies of this document may be made for your own use and for distribution to
+		others, provided that you do not charge any fee for such copies and further
+		provided that each copy contains this Copyright Notice, whether distributed in
+		print or electronically.
+	</para>
+</legalnotice>