Support bagging to a destination other than the source#92

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runderwood wants to merge 5 commits intoLibraryOfCongress:masterfrom

runderwood:35-other-destinations

Commits on Jun 20, 2017

add destination argument and handle not-in-place bag generation. multiple sources remain broken, awaiting clarification.
runderwood
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make bag w/ destination passing
runderwood
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bag to destination directory, refs. #35
runderwood
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fix path for hashing from source when making bags with a destination
runderwood
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add tests to improve coverage
runderwood
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