Immigration and Customs Enforcement officials are preparing to roll out a series of changes at several privately owned immigration detention centers, including relaxing some security measures for low-risk detainees and offering art classes, bingo and continental breakfast on the weekends. The changes were welcomed by immigrant advocates who have been waiting for the Obama administration to deliver on a promise made in August to overhaul the nation's immigration detention system. The 28 changes identified in the e-mail range from the superficial to the substantive. In addition to “softening the look of the facility” with hanging plants and offering fresh carrot...