storage/filesystem: call initialization explicitely, fixes #408

filesystem.Storage was initializing the gitdir (creating objects
and refs) on NewStorage. But this should be done only on init and
clone operations, not on open.

Now there is a new interface storer.Initializer that storers can
implement if they need any initialization step before init or clone.
filesystem.Storage is one of such implementations.

git.Init and git.Clone now call to the storer Init() method if it
does implement it. Otherwise, it just ignores initialization.

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