RDB Shredder: run the unit tests systematically in Travis (closes #3229)
RDB Shredder: run the unit tests systematically in Travis (closes #3229)

acgray/snowplow,RetentionGrid/snowplow,Propertyfinder/snowplow,RetentionGrid/snowplow,snowplow/snowplow,sspinc/snowplow,aldemirenes/snowplow,sspinc/snowplow,RetentionGrid/snowplow,liveintent-berlin/snowplow,aldemirenes/snowplow,Propertyfinder/snowplow,sspinc/snowplow,acgray/snowplow,sspinc/snowplow,aldemirenes/snowplow,aldemirenes/snowplow,snowplow/snowplow,acgray/snowplow,liveintent-berlin/snowplow,Propertyfinder/snowplow,aldemirenes/snowplow,Propertyfinder/snowplow,Propertyfinder/snowplow,aldemirenes/snowplow,RetentionGrid/snowplow,liveintent-berlin/snowplow,Propertyfinder/snowplow,RetentionGrid/snowplow,acgray/snowplow,snowplow/snowplow,acgray/snowplow,sspinc/snowplow,liveintent-berlin/snowplow,sspinc/snowplow,liveintent-berlin/snowplow,acgray/snowplow,liveintent-berlin/snowplow,snowplow/snowplow