These instructions were based off of this blog post.
Go to the root directory of your dot files.
cd ~/.dan
Add the git repository of the plugin you want as a remote
git remote add someplugin https://github.com/someguy/someplugin.git
git subtree add --prefix .vim/bundle/someplugin someplugin master --squash
And to updated later
git subtree pull --prefix .vim/bundle/someplugin someplugin master --squash
Messing up
If you screw up and do a git fetch someplugin master, here is how to undo it.
First, remove all branch references to the bad tree.
git remote remove someplugin
There may be tags - if you don’t have any tags and all the tags belong to the bad tree kill them all like so
git tag | xargs git tag -d
Now when you look at git lg you should not see any of the bad commits.
To remove all these commits do the following
git reflog expire --all --expire-unreachable=0
git repack -A -d
git prune
And that should fix it