v2.0.0

Big re-design. Made BetterBag class a subclass of bagit.Bag. Having easier access to its code stripped away a lot of duplicated code. Other main changes:

• Moved from using optparse to argpase
• User output now uses logging module instead of custom output
• Uses more bagit functionality to avoid code duplication (ex. for checksum generation, algorithms, etc.)
• Multiprocessing no longers closes and reopens with each directory being bagged, but stays open for the whole checksum generation process
• Changed mode select from positional argument to option
• Made bag and unbag log classes
• Removed custom exceptions
• Changed from using shutil's copytree to copy2 in a loop for better logging
• CSV versions of bag manifests created when bagging now
• Unbagging-in-place no longer validates after moving files
• /data folder given new name when unbagging-in-place to avoid conflicts if there are any subfolders also called "data"
• Marked non-public methods/functions
• Various other changes

bagitBB 1.0.0

Initial release.