Experimental cleanup

First commit to fix: #252

And second commit, as we shouldn't keep around broken things. If we there's plans on readding it (e.g. when a new avro plugin comes out), there should be a ticket for it -- but keeping around broken things seem like a bad idea (and actually, even breaks sbt eclipse in this case). And the pom.xml file if we don't support, as seen on the mailing list only confuses people

If the 2nd commit is too controversial, you can just push the first xD