Rename README file to README.md file for database bindings.

Rename README file to README.md file for the following DB bindings so the build process can generate binding specific tar balls for them. (currently they are broken because the build process looks for README.md)

dynamodb
hypertable
mapkeeper
nosqldb

[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

Proposed fix for #327.