a2x does not find icons when creating an epub

[Andrew Myers]

When trying to create an epub using the asciidoc a2x utility there is an error about missing icons. These icons
are on the path /usr/share/xml/docbook/stylesheet/docbook-xsl/images but the directory must be copied
locally and passed as --icons-dir for a2x to successfully generate an epub.

This problem is documented here: http://www.methods.co.nz/asciidoc/epub-notes.txt under the heading
"=== epub: Unreferenced callout icons in OPF" with a note that a workaround was implemented in version 8.6.5 of a2x.
Ubuntu 14.10 currently installs 8.6.9 so this workaround appears to be broken now.

To reproduce:

wget http://www.methods.co.nz/asciidoc/userguide.txt
a2x -L -f epub userguide.txt

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: asciidoc 8.6.9-3
ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
Uname: Linux 3.16.0-24-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
CurrentDesktop: Unity
Date: Sun Dec 14 19:05:49 2014
InstallationDate: Installed on 2014-11-20 (24 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/zsh
SourcePackage: asciidoc
UpgradeStatus: No upgrade log present (probably fresh install)

[Joseph (aerostitch)]

I am unable to reproduce this problem with the latest version (8.6.9-5).
Please reopen if you still reproduce the issue.
Thanks