Skip deployment of swift-load-generator

This is a big shade jar that is used mainly for perf testing and is not a library, don't really need to waste space on deployment servers by deploying this.
Move to nifty 0.6.0 for swift 0.6.0 release
[maven-release-plugin] prepare release swift-root-0.6.0
[maven-release-plugin] prepare for next development iteration