Documentation: dynamically set current version

Fixes #369

Makefile

@@ -92,13 +92,16 @@ endif
 
 %.xml: %.asc
 	@rm -f -- "$@"
-	asciidoc -d manpage -b docbook -o "$@" $<
+	asciidoc -a "version=$(DRACUT_MAIN_VERSION)$(GITVERSION)" -d manpage -b docbook -o "$@" $<
 
 dracut.8: dracut.usage.asc dracut.8.asc
 
 dracut.html: dracut.asc $(manpages) dracut.css dracut.usage.asc
 	@rm -f -- dracut.xml
-	asciidoc -a numbered -d book -b docbook -o dracut.xml dracut.asc
+	asciidoc -a "mainversion=$(DRACUT_MAIN_VERSION)" \
+		-a "version=$(DRACUT_MAIN_VERSION)$(GITVERSION)" \
+		-a numbered \
+		-d book -b docbook -o dracut.xml dracut.asc
 	@rm -f -- dracut.html
 	xsltproc -o dracut.html --xinclude -nonet \
 		--stringparam custom.css.source dracut.css \

dracut.8.asc

@@ -3,6 +3,7 @@ DRACUT(8)
 :doctype: manpage
 :man source:   dracut
 :man manual:   dracut
+:man version:  {version}
 
 NAME
 ----

dracut.asc

@@ -1,8 +1,8 @@
-dracut
+dracut {mainversion}
-======
+====================
-Harald Hoyer <harald@redhat.com>
+:author: Harald Hoyer
-v3.0, October 2013
+:email: harald@redhat.com
-
+:revnumber: {version}
 :language: bash
 
 = Introduction

dracut.bootup.7.asc

@@ -3,6 +3,7 @@ DRACUT.BOOTUP(7)
 :doctype: manpage
 :man source:   dracut
 :man manual:   dracut
+:man version:  {version}
 
 NAME
 ----

dracut.cmdline.7.asc

@@ -3,6 +3,7 @@ DRACUT.CMDLINE(7)
 :doctype: manpage
 :man source:   dracut
 :man manual:   dracut
+:man version:  {version}
 
 NAME
 ----

dracut.conf.5.asc

@@ -3,6 +3,7 @@ DRACUT.CONF(5)
 :doctype: manpage
 :man source:   dracut
 :man manual:   dracut
+:man version:  {version}
 
 NAME
 ----

dracut.modules.7.asc

@@ -3,6 +3,7 @@ DRACUT.MODULES(7)
 :doctype: manpage
 :man source:   dracut
 :man manual:   dracut
+:man version:  {version}
 
 NAME
 ----

lsinitrd.1.asc

@@ -3,6 +3,7 @@ LSINITRD(1)
 :doctype: manpage
 :man source:   dracut
 :man manual:   dracut
+:man version:  {version}
 
 NAME
 ----

mkinitrd.8.asc

@@ -3,6 +3,7 @@ MKINITRD(8)
 :doctype: manpage
 :man source:   dracut
 :man manual:   dracut
+:man version:  {version}
 
 NAME
 ----