[Request] Use .npmrc message key if available

[filipekiss]

It would be nice if I can have the message option set on my .npmrc and commit-and-tag-version could use that if no --releaseCommitMessageFormat was passed in the CLI. That way, if someone releases using npm version for any reason, at least the messages will always be consistent.

[TimothyJones]

Thanks for this request. I really like this idea - in fact, it would be nice if you could specify any options in any way.

In general, the options need to be overhauled. At the moment, there are some options that are only available via the package.json keys, and some options that are only available via the CLI. At the time that those options are overhauled, it would be very easy to add .npmrc as another potential source (although perhaps .versionrc is a more appropriate place, I am not sure).

See also #31 and #44

[filipekiss]

I'll take a look and at those and, if I have some time, might take a shot at implementing it :) Thanks for the feedback.