rename register to risc

seems to fit the layer much better as we really have a very reduced
instruction set

lib/risc.rb

@@ -0,0 +1,24 @@
+class String
+  def camelize
+    self.split("_").collect( &:capitalize ).join
+  end
+end
+
+
+require "risc/padding"
+require "risc/positioned"
+require "vm"
+
+require "parfait"
+require "risc/machine"
+
+class Fixnum
+  def fits_u8?
+    self >= 0 and self <= 255
+  end
+end
+
+
+require "risc/instruction"
+require "risc/register_value"
+require "risc/assembler"