documentation: add Makefile to generate pdfs from odt files

The odt files in the documentation directory are hard to consume
in that form. This adds a Makefile that generates pdfs from the
odt files, using the unoconv tool, based on the idea/github tree
https://github.com/jessfraz/apparmor-docs from
Jessica Frazelle <me@jessfraz.com>.

Signed-off-by: Steve Beattie <steve@nxnw.org>
Acked-by: Seth Arnold <seth.arnold@canonical.com>

documentation/Makefile

@@ -0,0 +1,36 @@
+# ----------------------------------------------------------------------
+#    Copyright (c) 2016 Canonical Ltd.
+#
+#    This program is free software; you can redistribute it and/or
+#    modify it under the terms of version 2 of the GNU General Public
+#    License published by the Free Software Foundation.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+# ----------------------------------------------------------------------
+NAME 		= documentation
+all:
+COMMONDIR=../common/
+
+include $(COMMONDIR)/Make.rules
+
+all: docs
+
+SOURCES:= $(wildcard *.odt)
+DOCS:=$(SOURCES:.odt=.pdf)
+
+.PHONY: docs
+docs: $(DOCS)
+
+%.pdf: %.odt
+	unoconv -v -f pdf --output "$@" "$<"
+
+.PHONY: clean
+ifndef VERBOSE
+.SILENT: clean
+endif
+clean:
+	rm -f *.pdf
+