This commit upgrades the Elasticsearch dependency from version 2.3.4 to
version 2.4.0.

This commit upgrades the Elasticsearch dependency from version 2.3.2 to
version 2.3.4

This commit switches the Elasticsearch test runner from TestNG to JUnit.

This commit bumps the version of the Elasticsearch dependency for the
Elasticsearch binding to version 2.3.2.

This commit bumps the Elasticsearch dependency version from 2.1.1 to
2.2.0.

This commit fixes the Elasticsearch name throughout the YCSB benchmark
project from "ElasticSearch" to "Elasticsearch".

- define checkstyle configs in as few places as possible
- use checkstyle:check since it has defaults that match what we want (fail after logging to console)
- modules that have current failures set property checkstyle.failOnViolation to false.

Bumped elasticsearch version and fix multiple api changes.
update README.md troubleshoot section.

As a part of branching to stage 0.2.0 release in #266, set version
for continued development on master branch.

* remove unused declared deps in a few places
* lex sort modules in top level pom
* update maven plugin versions.
* no more jar-with-dependencies
* set ycsb-core to provided in bindings
* introduce a bindings-parent pom that sets
** stage dependency copy on building binding
** iff binding has a README.md, build a binding-specific dist artifact
* update distribution assembly to
** properly build after modules
** use per-binding sets of dependencies

closes #250

* Need a SNAPSHOT version because non-SNAPSHOT is reserved for actual releases.
* Increment minor version per pre-1.0 guidelines from the Version Numbers guide

Fixes #236.