Comcast Weasel Versions Save

New Features:

• Now uses SPDX identifiers instead of simple license names.
• Recognizes SPDX-License-Identifier: comments in files for file license identification.
• Now recognizes a lot more licenses and does so far more intelligently.
• Now handles .gitignore files, even when not in a git work tree.
• Recognizes nested .dependency_license files.