[release] Update the top level README.md file to point to the 0.11.0 release

[googledatastore] Upgrade googledatastore API from v1beta3 to v1.

[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