DATAMONGO-846 - Prepare Release 1.3.4.

Updated change log, notice, read me. Updated SD Commons dependency to 1.6.4.RELEASE. 
Configured a "dummy" repository into MongoRepositoryFactoryBean in MongoRepositoryfactoryBeanUnitTests to prevent an IllegalStateException since changes in SD Commons 1.6.4 (via DATACMNS-432) require a Repository interface to be configured.