amend push submodules

Amend current changes and push all submodules. (apush-submodules)

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

$ egit amend-push-submodules

# Amend and push changes in "wiki" submodule
$ egit clone-init-submodules nodef/extra-git
$ cd extra-git
$ echo "web-NotreDame" > wiki/graphs.md
$ egit amend-push-submodules