[core] added configurable percentile values

Fixed #336. Classpath handling BasicDB from source

[docs] Update README for 0.4.0 release.

Closes #409

In OneMeasurementHdrHistogram, now reading hdrhistogram.percentiles
from workload configuration. This property is a comma delimited string
of Integers to use as percentile values.

This implements #437

[licensing] Added ASLv2 headers to files without them for v0.4.0. Removed old copy of Javadoc.

Fix 90th percentile reported as 95th

Fixes #438

get_classpath_from_maven(database) now does not alter the project name
before giving it to Maven. main() now calculates the db_dir with core
and uses the core project for Maven, otherwise things work as they did
before.

fixes #336

[hbase10] Skip HBase MiniCluster tests on Windows

fixes #434 

[core] Update the AcknowledgedCounterGenerator to use a power of two and mask.

size for the window so a mask can be used instead of a modulo operation.
This avoids issues when there is overflow of the id integer values to
negative values.

[mongodb] Add mongodb.upsert configuration option.

Added a configuration option (mongodb.upsert) to control if the driver
performs inserts or upserts operations for the DB.insert() method.
Defaults to doing inserts.

Note: Change in behavior from previous versions that performed upserts
for non-batched DB.insert() operations.

Fixes #400.

[redis] Fix the label for a redis parameter

host, not url.

[cassandra-cql] Make CassandraCQLClient more consistent.

The CassandraCQL client defines a number of

* Changes the default port to 9042 (this is the default CQL port).
* Changes property "host" from a space-separated list to property
  "hosts", a comma-separated list.
* Updates a few messages.

Use a PageFilter in HBase scans

Via `hbase.usepagefilter`

Other bindings limit the number of results retrieved from the server.
The HBase bindings just close the scanner once they have received the
desired number of records. Adding a PageFilter matches the behavior of
other bindings, and may improve performance.

[aerospike] Bring Aerospike adapter in line with adapter policy

* ! Aerospike client no longer retries over errors
* ! Aerospike client no longer backs off during cluster overload