Merge branch 'jh/submodule-foreach'

Merge branch 'jh/submodule-foreach'

* jh/submodule-foreach:
  git clone: Add --recursive to automatically checkout (nested) submodules
  t7407: Use 'rev-parse --short' rather than bash's substring expansion notation
  git submodule status: Add --recursive to recurse into nested submodules
  git submodule update: Introduce --recursive to update nested submodules
  git submodule foreach: Add --recursive to recurse into nested submodules
  git submodule foreach: test access to submodule name as '$name'
  Add selftest for 'git submodule foreach'
  git submodule: Cleanup usage string and add option parsing to cmd_foreach()
  git submodule foreach: Provide access to submodule name, as '$name'

Conflicts:
	Documentation/git-submodule.txt
	git-submodule.sh