How can I configure warbler to add a file from a subdirectory to the root of java_classes
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I have a Ruby app with a `config` directory.  In that directory is `config/logback.xml`.  I need this file to bee on the root of my classpath, so in my warbler config file, I tried adding this:

`config.java_classes << 'config/logback.xml'`

This resulted in the file being copied to `WEB-INF/classes/config/logback.xml`.  But I would like it to be at `WEB-INF/classes/logback.xml`.  Is there a way to get warbler to do this?

The easy work-around is to move `config/logback.xml` to `logback.xml`, but I'd rather not if there's away (pathmaps?) to have warbler just do what I want.