Add details from original tag

The original tag was being used as the basis for a branch or commit,
which would result in errors when parsing.  This stores a reference
to the commit the original tag points to, and, when backing up as
a tag, it also stores the original tag message.

Change-Id: Ie23739630f18e8af0aa7a76c1e4f9b362a5f2d6b
1 file changed
tree: e5a5ec764678c9297b4d86e21e1ce9d57d6d34a3
  1. src/
  2. .gitignore
  3. BUCK