Merge branch 'cf/submodule-progress-dissociate'

"git submodule update" and "git submodule add" supported the
"--reference" option to borrow objects from a neighbouring local
repository like "git clone" does, but lacked the more recent
invention "--dissociate".  Also "git submodule add" has been taught
to take the "--progress" option.

* cf/submodule-progress-dissociate:
  submodule: add --dissociate option to add/update commands
  submodule: add --progress option to add command
  submodule: clean up substitutions in script

Documentation/git-submodule.txt

@@ -239,6 +239,13 @@ OPTIONS
 --quiet::
 	Only print error messages.
 
+--progress::
+	This option is only valid for add and update commands.
+	Progress status is reported on the standard error stream
+	by default when it is attached to a terminal, unless -q
+	is specified. This flag forces progress status even if the
+	standard error stream is not directed to a terminal.
+
 --all::
 	This option is only valid for the deinit command. Unregister all
 	submodules in the working tree.
@@ -362,7 +369,15 @@ the submodule itself.
 	this option will be passed to the linkgit:git-clone[1] command.
 +
 *NOTE*: Do *not* use this option unless you have read the note
-for linkgit:git-clone[1]'s `--reference` and `--shared` options carefully.
+for linkgit:git-clone[1]'s `--reference`, `--shared`, and `--dissociate`
+options carefully.
+
+--dissociate::
+	This option is only valid for add and update commands.  These
+	commands sometimes need to clone a remote repository. In this case,
+	this option will be passed to the linkgit:git-clone[1] command.
++
+*NOTE*: see the NOTE for the `--reference` option.
 
 --recursive::
 	This option is only valid for foreach, update, status and sync commands.