code: public <E> boolean put(E entity, EntityMapper<E> entityMapper) {
      return put(entity, null, entityMapper);
    }
docs: Execute a Put on HBase, creating the Put by mapping the key and entity to a
  Put with the entityMapper.
  
  Any PutModifers registered with registerPutModifier will be invoked before
  the Put is executed.
  
  @param entity
  The entity to map to a Put with the entityMapper.
  @param entityMapper
  The EntityMapper to map the key and entity to a put.
  @return True if the put succeeded, False if the put failed due to update
  conflict