File cleanup fails on Windows

[birkland]

This is usually due to failure to close files/streams when finished

Clean up of package download directory failed: Unable to delete file: C:\Users\D                                                                                                                                                                                               ev\AppData\Local\Temp\IpmPackager2814470264730709955.content-dir\osfstorage_PREC                                                                                                                                                                                               IP_15_documentation.pdf
java.io.IOException: Unable to delete file: C:\Users\Dev\AppData\Local\Temp\IpmP                                                                                                                                                                                               ackager2814470264730709955.content-dir\osfstorage_PRECIP_15_documentation.pdf
        at org.apache.commons.io.FileUtils.forceDelete(FileUtils.java:2279)
        at org.apache.commons.io.FileUtils.cleanDirectory(FileUtils.java:1653)
        at org.apache.commons.io.FileUtils.deleteDirectory(FileUtils.java:1535)
        at org.dataconservancy.cos.packaging.OsfContentProvider.close(OsfContent                                                                                                                                                                                               Provider.java:216)
        at org.dataconservancy.packaging.shared.IpmPackager.buildPackage(IpmPack                                                                                                                                                                                               ager.java:117)
        at org.dataconservancy.cos.packaging.cli.PackageGenerationApp.run(Packag                                                                                                                                                                                               eGenerationApp.java:262)
        at org.dataconservancy.cos.packaging.cli.PackageGenerationApp.main(Packa                                                                                                                                                                                               geGenerationApp.java:191)