Maintenance Release

This patch release bundles up miscellaneous changes.

0.3.0 - Support for ES 2.0

Update stats structs to support ES 2.0; Add Thread Pool stats

* Addresses #8
* Update README to note changes in ES 2.0
* Add stats for thread pool

0.2.1

Correctly set up to 0 if we can't reach ES. Make sure all our metrics get sent.

Cleanup

v0.2.0

Merge branch 'export_cluster-wide_node_stats' of https://github.com/d…

v0.1.1: 0.1.1: Add a handful of new counters for indexing and merging

New metrics for indexing and merging.

v0.1.0

Initial release