SAMZA-740: Adding ElasticsearchProvider and grid functionality

[Spedge]

I'd put together an example of how to use the new ElasticsearchProvider for my work colleagues and I thought it'd be worth submitting it back to the community. This also includes a script to start elasticsearch and kibana on the host - be aware, there's a 64bit version depending on what machine you want to run against. Also note, this is against 0.10.0 of Samza which is not released yet. I am making the assumption that the Elasticsearch jars are bundled as part of that - if not, we'll need to add them to the POM here.

[Spedge]

TravisCI will fail until 0.10.0 is released.