Proposed fix for #327.

[hbase10] Add integration tests for HBase 1.0 client

Uses an HBase mini-cluster to test the HBase binding.

[docs] update README for 0.3.1 release.

[hbase] Separate HBase v0.9x and v1.x bindings

Remove deprecated methods:
Put.add -> Put.addColumn.
KeyValue -> Cell.

HBase 0.94 requires an additional dependency on hadoop-core, but has no
source-level changes to the client.

hbase/ now contains the HBase v0.9 binding code.
hbase1/ now contains the HBase 1.0 binding code.

- *incompatible* Default measurement changed from histogram to hdrhistogram
  Users who want previous behavior can set the 'measurementtype' property to 'histogram'

- *incompatible* Reported 95th and 99th percentile latencies now in microseconds (previously in milliseconds)

Conflicts:
	core/src/main/java/com/yahoo/ycsb/measurements/OneMeasurementHdrHistogram.java

closes #371

[docs] Fixes #393 - Update the curl command to use the --location option

[travis] Fixes #389 - Update .travis.yml to use the container based infrastructure for Travis Builds.

[travis] Fixes #389 - Update .travis.yml to use the container based infrastructure for Travis Builds.

[docs] update README for 0.3.0 release.

Added ASLv2 header to most files missing one.

[core] Fix #380 by working around recorder/logger initialization timing.

The HdrHistogramReader makes some problematic assumptions on the roles
played by start time, base time and histogram start/end times. This is
to be revisited in a future release of HdrHistogram (see
https://github.com/HdrHistogram/HdrHistogram/issues/69). In the meantime
this change will make YCSB record as expected by the reader:
a. Set histogram log base time (same as start time)
b. Only create the recorder after the log has been setup

final, refactor repeated export code from subclasses.

[mongodb] Update the pom.xml to make checkstyle fail the build. Fixes #365

Updated code to satisfy the checkstyle validation.

Fixes #365

[mongodb] Update the MongoDB driver version to 3.0.3.

Fix HashMap (gh-353) bug.

Shutdown the status thread as soon as clients complete (Issue #316)

closes #239.

Origin patch in PR-286.