#167: Add a makeOrGet to DB Collection maker API.
#167: Add a makeOrGet to DB Collection maker API.

pettermahlen/mapdb,olupas/MapDB,codeaudit/mapdb,lamfire/mapdb,jankotek/MapDB,SleimanJneidi/mapdb,olupas/MapDB,binarytemple/mapdb,morfeo8marc/mapdb,jankotek/mapdb,sumit784/mapdb,ffjiao/mapdb,hangum/mapdb,jankotek/MapDB,cocosli/mapdb,mebigfatguy/mapdb,ringoluo/mapdb,jankotek/mapdb,mebigfatguy/mapdb