EntityMapper for composite columns using OneToMany

New EntityMapper for composite columns which uses a OneToMany
relationship between the parent entity, which has the Id for the row
key and child entities for each column with the value being a field of
the child.
resolve #327 . Unit test is included.
[Gradle Release Plugin] - pre tag commit:  '1.56.40'.
[Gradle Release Plugin] - new version commit:  '1.56.41-SNAPSHOT'.
Add 'native' query to EntityManagers.

Extend the functionality of CompositeEntityManager to query a column
slice using the new NativeQuery interface
Merge pull request #323 from elandau/new_composite_mapper

EntityMapper for composite columns using OneToMany
Merge pull request #331 from michaelp/master

Bug fix. Resolve #327
Fix unit test
Merge pull request #334 from elandau/new_composite_mapper

Fix unit test
Excluding log4j
Add osgi support
Merge remote-tracking branch 'origin/master' into OSGI
Merge pull request #337 from bhoflack/OSGI

Add osgi support
write attributes column to chunked storage
Merge pull request #340 from stevenzwu/master

write attributes column to chunked storage
[Gradle Release Plugin] - pre tag commit:  '1.56.41'.
[Gradle Release Plugin] - new version commit:  '1.56.42-SNAPSHOT'.
Support super columns for auto pagination

Although deprecated for consistency auto pagination for super columns can be supported
Removed spurious System.out.println
Merge pull request #348 from noelmarkham/master

Removed spurious System.out.println