Hillary Clinton was a White House monster when she was first lady. That’s the assertion in a new book called “Crisis of Character” by Gary Byrne, which hits stores Tuesday. One of Hillary the Monster’s favorite targets was Vince Foster, according to Byrne, a member of the Secret Service who was stationed in the White House during the Clinton administration. Foster was the lawyer who relocated to Washington from Arkansas after his childhood pal, Bill Clinton, was elected president. “Word circulated that (Hillary Clinton) berated (Foster) mercilessly … I knew what it was like to be yelled at by superiors,...