Proposed CPAN::Meta patch: Version comparison, conversion, 999 problems

I've gone ahead and patched up a copy of the spec to resolve the version
issues I've been going on about (David, I wouldn't expect you to do the work
after you've just did all the work to mint the whole release).

The work can be found here for review.
http://github.com/schwern/cpan-meta/commits/master

I'm sure the wording around how to convert could be done better.

Here's what was done:

Clarifications:
--------------
AFAIK what I wrote exactly matches what version.pm does now.  If it doesn't,
its a mistake.

* Version comparison has been documented.

* Version conversion has been documented.


Changes:
-------
* Downgraded the 999 dotted version limit to a "should".
  Rationale: Its only for extreme backwards compat.

* Reduced the minimum number of integers in a dotted version to one.
  Rationale: Neither v1 nor v1.2 are ambiguous.

* Three integers in a dotted version is now a "should".
  Rationale: Its still a good idea.

* Changed the spec version to v3.0.0 to enable finer grained versioning
  spec changes.  See <http://semvar.org>.

* Changed the CPAN::Meta distribution version to v3.0.0.0 reflecting it
  as the first release of the library representing v3.0.0 of the spec.
  See https://rt.cpan.org/Ticket/Display.html?id=55718 for the patch
  that allows vX.Y.Z Dist::Zilla versions.


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