Merge pull request #6 from benben/master

FTP deployment
document that we support the after_build hook
thanks everybody! for reals!
whoa! three deploy methods! sweet! exclamation points!!!
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Merge pull request #8 from benben/git-deploy

Better git deployment.

 * Remove outdated git gem.
 * Support git remotes other than "origin".
 * Use "build" directory as tmp git repo.
Clean-up documentation.
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