first interpreted tests, fix branch issues

whole branch logic wobbly
better syntax needed, but working(ish) for now

lib/register/instructions/branch.rb

@@ -11,9 +11,9 @@ module Register
     attr_reader :block
 
     def to_s
-      "Branch: #{block.name}"
+      "#{self.class.name}: #{block.name}"
     end
-    alias :inspect :to_s 
+    alias :inspect :to_s
   end
 
   class IsZeroBranch < Branch