Previous to this change, symlinks at
http://static.springsource.org/spring-integration/docs had to be
maintained by hand. The build now automatically updates:
* 'Wildcard' symlinks (e.g.: 2.0.x -> 2.0.0.RC1) if the release type
is anything other than SNAPSHOT.
* 'Latest GA' symlink (e.g.: latest-ga -> 1.0.3.RELEASE) if the release
type is RELEASE.
Also, deletion of the docs zip archive is now consolidated into the
same 'sshexec' command as the unzipping itself. Unzipping is now
done with -q (quiet) to cut down on output noise.
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