libraryofcongress repo is now canonical
it is bagit-python now, not bagit :grimacing:
seems travis-ci cares about libraryofcongress vs LibraryOfCongress, who knew?
doc fix
Add test for bagging content with 'data' present
Fix crash when bagging content containing 'data' dir

Fixes #29
Merge branch 'master' of https://github.com/BHSPitMonkey/bagit into 29-make-bag-when-data-present
merge latest upstream commits incl existing data dir fix