Update - Automatic package scanning for entities declaration

Hello 47deg,

This pull request (is my first one on github, I hope I did it correctly) adds the capacity of declaring a base package for entities, instead of declaring each class individually.
- XML style :
    &lt;property name="entitiesPkg" value="com.mypackage.domain.model" /&gt;

- JAVA style :
      factory.setEntitiesPkg( "com.mypackage.domain.model" );

Only the classes that have an @ColumnFamily annotation are taking into account.
All tests passes.

Have a nice day,
Julien

Signed-off-by: jrevault <jrevault@gmail.com>