Check local repo is up-to-date in release()

[hadley]

@wch do you know how to do this? (i.e. I want to make sure there aren't commits on remote that I need to pull)

[wch]

Maybe a git fetch and then compare SHAs for HEAD and the tracking branch?

Or maybe parse the output of git branch -vv, as suggested at http://stackoverflow.com/a/12538667/412655

$ git branch -vv
* master cd0a739 [origin/master: ahead 1] Update license information

[hadley]

Done (mostly) in 14cca3f

[lock]

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