Updating to solr 4.3.0

For admittedly selfish reasons, I've updated solr to 4.3.0. I use 4.3 and I don't want to run two jetties, one for hydra-jetty and one for my own version of solr.

I updated all the relevant jar files for the new version, and it only took a one-line change in solrconfig to make it work. I also removed a lot of extraneous jars that apparently weren't being used. The caveat there is that if anyone is using their own solrconfig that makes use of these included jars, it won't work unless you put them back in to your local jetty. That could be a point for discussion.

I've tested this against hydra-core, but I wasn't able to run the full ci build because I didn't know how to override the whole jetty extraction thing. So, if someone wants to do that before merging this, it might be a good idea.