Duplicate entries in zip

[jroper]

The scriptClasspathOrdering config in JavaAppPackaging.settings adds the projects binary to the config, regardless of whether it's already there or not. The comment there suggests that there is a reason for this. That's ok, but the result is that for zip packaging for example, you end up with the binary packaged twice, and then when you unzip, the Linux unzip command stops on the second entry and prompts you to ask whether you want to overwrite it or not. Either the scriptClasspathOrdering should be fixed, or when it's added to mappings, distinct needs to be called on it.

[huntc]

Associated PR: #26

[benmccann]

Looks like this issue is fixed now and can be closed. #26

[jsuereth]

Thanks @benmccann and @huntc