Fixing data loss issue on include/exclude changes.
Back up files before del/overwrite from server.
Allow packing of previous backups into a git repo.
Adding function to list all files in sync set.
Improvements to help, logging, and code comments.
Add info on backup/pack/list/filter to README.md.
Improvements to README.md.
Fix comments and log messages.
Improve logging on failed sync and stale lock dir.
Fix typos in README.md.
Merge pull request #37 from torfason/master

Bug fix, backup, git packing, and help command