WriteKaTeX
? change name to Overleaf, and now have a very good editor and git repos through https without authentication! To clone just change the www in the project URL by git.
To clone overleaf project over an existing repo,
[+]
e.g, github repo: creates a new blank project
$ git remote add overleaf https://git.overleaf.com/overleafhash
$ git pull overlaf master
$ git rm main.tex
$ git commit -a -m "Merge with overleaf"
$ git push overleaf master
Then, remove/rename any conflicting files and try to push again. The registered changes in the "Versions" tab, are registered as commits messages in the repo.
Long instructions:
http://gfif.udea.edu.co/web/tiki-read_article.php?articleId=172