Fix MemoryRepository.
Fix MemoryRepository.

It was erroneously using Time.now.to_i or Time.now where it should have
been using Time.now._dump.

$ ruby lib/repo/test/memory_repository_test.rb passes now.

selyanhb/Markus,melneubert/Markus,ealonas/Markus,Lysette/Markus,kmccoan/Markus,binuri/Markus,ealonas/Markus,arkon/Markus,benjaminvialle/Markus,MarkUsProject/Markus,Lysette/Markus,finnergizer/Markus,wkwan/Markus,WilsonChiang/Markus,WilsonChiang/Markus,MarkUsProject/Markus,jeremygoh/Markus,benjaminvialle/Markus,Lysette/Markus,benjaminvialle/Markus,finnergizer/Markus,WilsonChiang/Markus,finnergizer/Markus,jeremygoh/Markus,reidka/Markus,SoftwareDev/Markus,melneubert/Markus,david-yz-liu/Markus,Lysette/Markus,wkwan/Markus,david-yz-liu/Markus,reidka/Markus,david-yz-liu/Markus,kmccoan/Markus,binuri/Markus,binuri/Markus,arkon/Markus,ealonas/Markus,melneubert/Markus,wkwan/Markus,arkon/Markus,WilsonChiang/Markus,Lysette/Markus,melneubert/Markus,binuri/Markus,wkwan/Markus,WilsonChiang/Markus,finnergizer/Markus,binuri/Markus,jeremygoh/Markus,ealonas/Markus,benjaminvialle/Markus,jeremygoh/Markus,david-yz-liu/Markus,arkon/Markus,SoftwareDev/Markus,arkon/Markus,kmccoan/Markus,selyanhb/Markus,binuri/Markus,melneubert/Markus,jeremygoh/Markus,reidka/Markus,reidka/Markus,MarkUsProject/Markus,arkon/Markus,binuri/Markus,jeremygoh/Markus,melneubert/Markus,finnergizer/Markus,WilsonChiang/Markus,benjaminvialle/Markus,selyanhb/Markus,wkwan/Markus,reidka/Markus,arkon/Markus,melneubert/Markus,kmccoan/Markus,selyanhb/Markus,selyanhb/Markus,arkon/Markus,selyanhb/Markus,ealonas/Markus,Lysette/Markus,reidka/Markus,WilsonChiang/Markus,finnergizer/Markus,david-yz-liu/Markus,benjaminvialle/Markus,kmccoan/Markus,david-yz-liu/Markus,MarkUsProject/Markus,ealonas/Markus,reidka/Markus,binuri/Markus,WilsonChiang/Markus,MarkUsProject/Markus,Lysette/Markus,david-yz-liu/Markus,ealonas/Markus,SoftwareDev/Markus,ealonas/Markus,melneubert/Markus,jeremygoh/Markus,SoftwareDev/Markus,MarkUsProject/Markus,selyanhb/Markus,SoftwareDev/Markus,jeremygoh/Markus,reidka/Markus,finnergizer/Markus,wkwan/Markus,david-yz-liu/Markus,binuri/Markus,WilsonChiang/Markus,MarkUsProject/Markus,kmccoan/Markus,reidka/Markus,benjaminvialle/Markus,SoftwareDev/Markus,arkon/Markus,finnergizer/Markus,melneubert/Markus,SoftwareDev/Markus,finnergizer/Markus,wkwan/Markus,MarkUsProject/Markus,kmccoan/Markus,wkwan/Markus,david-yz-liu/Markus,jeremygoh/Markus,ealonas/Markus,wkwan/Markus,selyanhb/Markus