Splitting a subfolder out into a new repository

https://help.github.com/articles/splitting-a-subfolder-out-into-a-new-repository/

git clone https://github.com/USERNAME/REPOSITORY-NAME

git filter-branch --prune-empty --subdirectory-filter FOLDER-NAME

git remote set-url origin https://github.com/USERNAME/NEW-REPOSITORY-NAME.git

git push -u origin BRANCH-NAME