Allow git fetch to take all: true like git add does

[agargiulo]

Currently, if I have:

git = Git.open 'foobar', log: Logger.new($stdout)
git.add all: true 

that works, it adds all the files inside the foobar repo
but if I try to do

git = Git.open 'foobar', log: Logger.new($stdout)
git.fetch all: true

I get:

I, [2015-04-01T11:51:02.644697 #65615]  INFO -- : Starting Git
I, [2015-04-01T11:51:02.664168 #65615]  INFO -- : /usr/local/bin/git '--git-dir=/Users/agargiulo/foobar/.git' '--work-tree=/Users/agargiulo/foobar' fetch '{:all=>true}'  2>&1
D, [2015-04-01T11:51:02.664233 #65615] DEBUG -- : ssh: Could not resolve hostname {: nodename nor servname provided, or not known
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

I'll look into writing up a PR for this when I have time for it.

[stale]

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