The Flintstones are making their way back to television. This week, Variety announced a new Flintstones animated series had been greenlit. Warner Bros. Animation and Elizabeth Banks’ Brownstone Productions are joining forces on this project, bringing it out of the Stone Age and into the 21st century. Currently, this Flintstones series hasn't found a home at any television network. This new adaptation of The Flintstones is described in Variety's reports as "a primetime animated adult comedy series based on an original idea featuring characters from The Flintstones." Now, it's unclear just how "adult" things will get on …