Add -f option: force output to standard output

It's a good idea to avoid dumping binary to the console, but I added a flag to override it so I can use it as a process with an output stream from a program (I'm using it as a terrible workaround for this [Java bug](http://bugs.java.com/bugdatabase/view_bug.do?bug_id=8019465).)

It wasn't obvious to me what letter to use for the option, and these are the first lines of Objective-C code I've ever written; I hope it's satisfactory.