added benchmark for SEL, showing how _incredibly_ slow it is atm. (>300x as slow as AR)
added benchmark for SEL, showing how _incredibly_ slow it is atm. (>300x as slow as AR)

tillsc/dm-core,engineyard/dm-core,ar-dm/ardm-core,datamapper/dm-core,tpitale/dm-core,alloy/dm-core