Make a geoserver.war file available for download with release

Now that we have a nice web config tool, it makes more sense to have a war file directly available for download. This would serve as a sort of binary, since users would not need ant to build the release. They could drop the war right in and start adding datastores and configuring GeoServer.

There are a few things that need to happen to make this possible.

• geoserver should not be hardcoded - supposedly not too hard on the java side, we need to look into how to do it for the jsps.

• add the building of the war to the release target, and be sure to upload it when putting out the release.

• Include the docs in the war, so that they are included in the release.

• Should probably also make a readme type document and put as the default root document, linking to the docs. Would be cool to do it as in gt2wms, where it loads a few of the sample files in various styles. It's a nice quick way to see if the installation is loaded.