commit push submodules

Commit current changes and push all submodules. (cpush-submodules)

Alternatives: commit-push, commit-push-submobules.
Similar: add-submodule, init-submobules, commit-push-submobules, amend-push-submobules.

$ egit commit-push-submodules <message># $GIT_COMMIT_PREFIX: prefix for commit messages

# Commit and push changes in "wiki" submodule
$ egit clone-init-submodules nodef/extra-git
$ cd extra-git
$ echo"web-Stanford"> wiki/graphs.md
$ egit commit-push-submodules "updated wiki"