[elasticearch] upgrade to version 2.4.0

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

[geode] Update to Apache Geode version 1.0.0-incubating.M3

[arangodb] Add ArangoDB Support

[couchbase2] Added support for ttl in Couchbase2

* Optimise fillBytesImpl so it doesn't trigger an Exception on every byte[] generated.

* Make the verbose output of BasicDB thread safe.

* Optimise the verbose output of BasicDB when using multiple threads

[mongodb] correct placement of xml header on logback configs.

Remove deprecated Cassandra clients

closes #798

Add additional IntelliJ project file to Git ignore

[scripts, couchbase] deprecate the old 'couchbase' client in favor of 'couchbase2'.

Various Elasticsearch improvements

This commit adds the IntelliJ ipr extension to .gitignore. These project
files are created when running the Maven goal idea:idea.

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

Today when running the Elasticsearch binding in embedded mode, a
temporary directory is used. This can be confusing for running usual
load-then-run style workflows because the temporary directory will not
be the same between runs. Instead, we should just require a directory
when running in embedded mode and this commit makes this the case.

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

This commit adds notes to the Elasticsearch documentation outlining the
difference between embedded and remote modes, and adds an example on
using remote mode.

[jdbc]Fix bug in constructing CREATE TABLE SQL statement

[scripts] Rados missing from properties file for new platform-specific scripts.

[release] update README for 0.10.0 release.

[couchbase2] fix regressions introduced in latest changes

this properly fixes #786 which has been reverted since it has some
side effects on other workloads and causes regressions.

This needs to be reverted because it breaks all the other codepaths since it
just doesn't return anything on read or scan.

This reverts commit 44660de7.

This fixes a regression introduced by switching over to the raw
workload where the key looks different now. The code trims and
removes the " " so that only the proper key is passed for retrieval.

[core] solve issue with hdrhistogram+raw 

Solve issue with hdrhistogram+raw which had combined hdrhistogram with histogram

[couchbase2] logical error in decode()

When dataintegrity=true, no field values in passed to verifyRow() for verify and keep on getting error.

[packaging] ensure new ycsb runner scripts are included in distribution tarballs.