Fix typo in redis/README.md

Add Accumulo as a backing data store

* Increment Accumulo Version to 1.6.0
* Fix accumulo dependency versions
  - Harmonize guava version for Accumulo.
  - Automatically manage slf4j version.
* Clean up depr. code
* Clean up return codes and error logging

Make the batchwriter's number of threads configurable.

clean up dead code in client.

* set .gitignore to standard eclipse
* update versions of Accumulo to 1.4.4
* Pin slf4j binding to 1.5.8

Accumulo, Thrift, and YCSB all use different versions of slf4j, causing
runtime issues because everything is bundled together. Pin the version
to something in the middle that seems to work, even if it's not the
latest and greatest version.

Based on YCSB++

http://www.pdl.cmu.edu/ycsb++/

[core] Add timestamp in ycsb qps and latency log 

[gemfire] Fix NullPointException when execute "ycsb run gemfire ..."

[redis] add README explaining how to run redid load tests

provides TravisCI configuration files 

ignore all target folder contents

[mongo] Update the MongoDB Java Driver version to 2.11.2.

JDBC scans did not instruct the driver to use a specific fetchsize,
resulting in most cases in an OOM; add support for setting fetchsize.

Also add support for disabling autocommit on the JDBC connections,
mostly because Postgres for example doesn't support setting fetchsize
without disabling autocommit.

* Time the cleanUp of a DBWrapper
* For HBase this clean up should also be counted as an update.

each test client.

Add a control (via properties) for the number of connections the Mongo
instance will create/use.

I have fixed a bug in insert() and delete() methods.There are also
some cosmetic changes to readme and properties files.

This patch comments out the gemfire plugin from the pom.xml as the
build fails with the following message:

[ERROR] Failed to execute goal on project gemfire-binding: Could not
resolve dependencies for project com.yahoo.ycsb:gemfire-binding:jar:0.1.4:
Failure to find com.gemstone.gemfire:gemfire:jar:6.6 in
http://dist.gemstone.com.s3.amazonaws.com/maven/release/ was cached in
the local repository, resolution will not be reattempted until the
update interval of gemstone has elapsed or updates are forced -> [Help 1]