renamed program to assembler (to avoid clashes in vm)

test/test_crystal.rb

@@ -6,9 +6,9 @@ require_relative 'helper'
 #  adc add and bic eor orr rsb rsc sbc sub mov mvn cmn cmp teq tst b bl bx swi strb
 
 class TestArmAsm < MiniTest::Test
-  # need Program and a block (see those classes) 
+  # need Assembler and a block (see those classes) 
   def setup
-    @program = Asm::Program.new
+    @program = Asm::Assembler.new
     #no ruby block given, ie need to add this block later by hand
     @block = @program.block
   end

test/test_runner.rb

@@ -26,7 +26,7 @@ class TestRunner < MiniTest::Test
     # execute
     # check result ?
     context = Vm::Context.new
-    builder = Asm::Program.new
+    builder = Asm::Assembler.new
     compiled = tree.compile( builder , context )
     puts compiled.inspect
   end

test/test_small_program.rb

@@ -9,7 +9,7 @@ require_relative 'helper'
 class TestSmallProg < MiniTest::Test
   # need a code generator, for arm 
   def setup
-    @program = Asm::Program.new
+    @program = Asm::Assembler.new
   end
 
   def test_loop