Revert "Mark spec as pending for JRuby"
Revert "Mark spec as pending for JRuby"

* This issue should be resolved upstream in DataObjects.
* See DO commit 5886a15e.

This reverts commit 80ccf6bc22116d2460444475a85123e97fc905ae.

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