[MERGE] Don't require an email to commit

[John Arbash Meinel]

I decided to do the change over the "right" way, and refactor the code a
bit to put the revision id and file id generators in the same location
(generate_ids.py). Originally I thought they would share more code, but
it turns out they are generated in slightly different ways. (@-+ are
stripped from file ids, etc)

The patch deprecates the functions in working_tree.py, and then creates
a new function gen_revision_id(), and adds a bunch of tests for it.

It also turns out that gen_root_id() didn't have any tests, so I just
added a simple one.

The new 'gen_revision_id()' does use rand_chars() rather than
hexlify(rand_bytes()), but I haven't changed the ordering of the
sections yet.  I figured this was the safest of the changes, and the
rest we can sort out later.

John
=:->
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