A Multicenter Phase I/II Trial of Abiraterone Acetate + BEZ235 in Metastatic, Castration-Resistant Prostate Cancer

There will be two parts to this clinical research study. The purpose of each part is: * Phase 1: This part of the study will determine what dose of BEZ235 is safe to give with a standard dose of abiraterone acetate and prednisone by administering different doses of BEZ235. This will help to find out what effects, good and/or bad, this combination has on CRPC. * Phase 2: This part of the study will measure the treatment effect of the combination of BEZ235 and abiraterone acetate/prednisone on CRPC.