Work In Progress: CPU behavior, UI changes

This is something of a "Work in Progress" checkpoint of several features
that are all half baked:

1. Allow loading of 16KB ROM files at address $C000 at run-time, not
   just at startup. See the "Load ROM..." File menu item.

2. Introduces the notion of "CPU Behaviors", so the core 6502 CPU
   implementation can match the behavior of either an early NMOS 6502, late
   NMOS 6502, or CMOS 65C02. Very little of this is actually implemented so
   far.

3. Adds a completely bogus implementation of the 6522 VIA (it
   does absolutely nothing right now).

4. Changes the address of the ACIA in the simulated system to match a
   real hardware implementation I put together.

README.md

@@ -4,8 +4,8 @@ SYMON - A 6502 System Simulator
 **NOTE: THIS IS BETA QUALITY SOFTWARE UNDER ACTIVE DEVELOPMENT.  Feedback is
 welcome!**
 
-**Version:** 0.5
-**Last Updated:** 21 October, 2012  
+**Version:** 0.6
+**Last Updated:** 5 November, 2012
 
 Copyright (c) 2008-2012 Seth J. Morabito <web@loomcom.com>
 
@@ -47,7 +47,7 @@ Maven will build Symon, run unit tests, and produce a jar file in the
 Symon is meant to be invoked directly from the jar file. To run with
 Java 1.5 or greater, just type:
 
-    $ java -jar symon-0.3-jar-with-dependencies.jar
+    $ java -jar symon-0.6-jar-with-dependencies.jar
 
 When Symon is running, you should be presented with a simple graphical
 interface.