Fixed inability to download spout from maven

Spout changed the format of their repository again. @tommytony probably didn't notice because it was cached in his local maven repositoy.
Merge pull request #586 from cmastudios/patch-1

Fixed inability to download spout from maven. Thanks @cmastudios.
Update version to 1.7.4.

Updated Bukkit dependency to 1.4.7-R1.0.