misc/git-hooks: add pre-receive hooks for the new archive URL support

Related to #458.
misc/git-hooks/pre-receive: set prefix on s3cmd version

Related to #458.
api: support version and archive-url parameters in the deploy handler

It doesn't do anything yet.

Related to #458.
docs/client/usage: fix tsuru usage docs

This text was older than me. Fix #785.