[core] Add a UnixEpochTimestampGenerator

[dynamodb] Checkstyle updates for DynamoDB.

[geode] Checkstyle updates for Apache Geode (incubating)

[tarantool] Checkstyle updates for the Tarantool binding.

[infinispan] Checkstyle updates for the Infinispan binding.

[core] Add byte to double and long conversion methods to Utils.

These will be used for #653 to write timestamps and numeric values
to the ByteIterator maps.

[hypertable] Checkstyle updates for the Hypertable binding.

Elasticsearch cleanup and version bump to 2.2.0

This commit fixes the Elasticsearch name in the README file for the
Elasticsearch project from "ElasticSearch" to "Elasticsearch".

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".

[core] added real version printout

Fixes #320

Updated top level README for YCSB 0.7.0 release

[couchbase] nit fix in Couchbase README

[orientdb] fixed scan with readallfields

[accumulo] don't run Accumulo tests on windows build.

The Accumulo tests don't properly initialize their mini cluster on windows,
so skip the tests entirely in that environment.

closes #617

Revert "[accumulo] don't run Accumulo tests on windows build."

[accumulo] don't run Accumulo tests on windows build.

The Accumulo tests don't properly initialize their mini cluster on windows,
so skip the tests entirely in that environment.

closes #617

[client] Added basic command line argument error messages to Client.java

Orientdb scan fix

[docs] Update link to old Yahoo! page due to site redesign.

[hbase10] Turn off info servers during tests