Okay, I missed the one reference to it in the Zips class. 
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On Tue, May 7, 2013 at 12:22 AM, Romain Manni-Bucau
<notifications@github.com> wrote:

>> @@ -101,6 +106,12 @@
>>              <version>${spock.version}</version>
>>              <scope>test</scope>
>>          </dependency>
>> +
>> +        <dependency>
>> +            <groupId>commons-io</groupId>
>> +            <artifactId>commons-io</artifactId>
>> +            <version>2.4</version>
> it eases the Zips class and since commons-io is in a bunch of PR it would be sad to not use it here and add useless code IMO, no?
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> https://github.com/asciidoctor/asciidoctor-maven-plugin/pull/35/files#r4107373