= subtree-merge =
See http://help.github.com/subtree-merge/
For instance
:	git remote add -f ewf_wiki https://github.com/EiffelWebFramework/EWF.wiki.git
:	git merge -s ours --no-commit ewf_wiki/master
:	git read-tree --prefix=doc/wiki/ -u ewf_wiki/master
:	git commit -m "Added subtree merged in doc/wiki"


Update
:	git pull -s subtree ewf_wiki master


= remove git submodule =
1. Delete the relevant section from the .gitmodules file.
2. Delete the relevant section from .git/config.
3. Run git rm --cached path_to_submodule (no trailing slash).
4. Commit and delete the now untracked submodule files.

Ex:
:	vi .gitmodules
:	vi .git/config
:	git rm --cached doc/wiki
:	git commit -m "Removed submodule doc/wiki"