version parsing

[Nate Finch]

a bug was discovered in our version parsing:
https://bugs.launchpad.net/juju-core/+bug/1588911

basically, 2.0.alpha10 was being parsed as the tag being alpha1 and the
patch being 0, instead of alpha and 10.  While correcting this problem, I
noticed that we were matching [a-zA-Z0-9_]+ for the tag... which I'm pretty
sure was a mistake.  After talking to Curtis and Martin, I changed it so
the tag is only [a-z]+.  I'm pretty sure this will not affect anyone else,
but posting it to the list just in case.

-Nate
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