Git remove some dirs

erase-git.sh

# Fetch
git clone https://github.com/username/reponame reponame
for b in `git branch -r | grep -v -- '->'`; do git branch --track ${b##origin/} $b; done

# Analyze
curl https://bootstrap.pypa.io/get-pip.py > get-pip.py && sudo python get-pip.py && rm get-pip.py
sudo pip install git-fat
git fat -a find 1000000

git ls-tree -r -t -l --full-name HEAD | sort -n -k 4

# Delete
git filter-branch --subdirectory-filter ios/South/ --prune-empty --tag-name-filter cat -- --all
git filter-branch --tree-filter 'rm -rf Pods' --prune-empty --tag-name-filter cat -- --all

# Migrate repo to LFS
https://github.com/github/git-lfs/issues/326

# Cleanup
git for-each-ref --format="%(refname)" refs/original/ | xargs -n 1 git update-ref -d
git reflog expire --expire-unreachable=all --all
git gc --aggressive --prune=now

# LFS Install
brew update && brew install git-lfs
ln -s /usr/bin/git /usr/local/bin/git # And then in SourceTree choose the Use System Git from /usr/local/bin

# LFS usage
git lfs init
git lfs track "**/*.mp4"