git-subtree-HOWTO.txt

# adding remote
git remote add module git@github.com:user/module.git 

# updating remote
git fetch module

# updating remote (tag)
git fetch Weaver 0.9.9

# adding subtree (master)
git subtree add -P module --squash -m "Added module as a subtree." module/master

# adding subtree (tag)
git subtree add -P GitSubtrees/Weaver --squash -m "Added Weaver 0.9.9 as a subtree." Weaver 0.9.9

# merging subtree changes
git subtree merge -P module --squash -m "Merged changes from module." module/master