Chess Fixes

It has come to our attention that there were a few minor errors in Standalone.java and SimpleBoard.java. I have fixed them and and updated the stubs, which you can use to update your code as desired. Also, I fixed up the section on the timers, which was a bit out of date. Sorry if this caused major confusion. Also, if you have questions about anything in the assignment, please check the bboard--Owen and I have been making an effort to clarify things there if they are asked.