By SOUMYA KARLAMANGLA Nick Reiner appeared briefly in court Wednesday morning, a day after he was charged with murder in the death of his parents, celebrated director Rob Reiner and Michele Singer Reiner. Nick Reiner, 32, had been scheduled to appear in Los Angeles Superior Court for an arraignment, during which he was expected to enter a plea. But his lawyer, Alan Jackson, told the court that it was “too early” for a plea and that he and the prosecution had agreed to delay the arraignment....