Submodule idea

I *think* that it would be a great benefit if "git submodule update" would 
leave you on a branch if (a) you were on that branch before, and (b) 
pulling on that branch would update it to the commit that the superproject 
specifies for that submodule.

Or maybe there should be a "git submodule fetch" which fetches from the 
remote, and replaces FETCH_HEAD with the superproject's index entry, and 
"git submodule pull" would merge it? (With the model being that the entry 
in the superproject is an additional remote that you both track and 
publish to)

	-Daniel
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