Updated Resource#inspect to not automatically lazy-load every property
Updated Resource#inspect to not automatically lazy-load every property

* Display "<not loaded>" in place of any lazy property that is not
  currently loaded.  The previous behavior was to cascade and load
  every property, resulting in extra queries to be executed under the
  hood and generally causing confusion over whether or not lazy
  loading was actually working

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