Fix off by ones in word and punctuation selection

As documented on http://docs.oracle.com/javase/7/docs/api/java/util/Random.html#nextInt(int) nextInt between 0 (inclusive) and the given value (exclusive). The code assumed it would generate inclusive the given value. This caused "vulputate" and "?" to never occur in the generated LoremIpsum's. This pull fixes the two off by ones.