Clean-up git repo
There is a lot of huge files (>2GB) in the git repo.
They should be removed.
-> This will cause a history change (new hash for commits) and
therefore the hash in the released firmware (sdb record) will be
wrong.
Reference:
http://naleid.com/blog/2012/01/17/finding-and-purging-big-files-from-git-history/