sorting mom instructions and statements into separate dirs

lib/mom.rb

@@ -14,4 +14,5 @@
 module Mom
 end
 
-require_relative "mom/instruction.rb"
+require_relative "mom/instruction/instruction.rb"
+require_relative "mom/statement/statement.rb"

lib/mom/README.md

@@ -62,7 +62,7 @@ To make the transition even easier, it is done in two steps.
 
 ## 1. Everything but control structures
 
-So we go from language to machine as the first step, in terms of memory instructions.
+wSo we go from language to machine as the first step, in terms of memory instructions.
 Memory gets moved around between the main machine objects (frames and messages).
 But control structures stay "intact", so we stay at tree structure
 

lib/mom/instruction/instruction.rb

@@ -32,4 +32,3 @@ require_relative "slot_load"
 require_relative "return_sequence"
 require_relative "message_setup"
 require_relative "argument_transfer"
-require_relative "statement"

lib/mom/statement/statement.rb

@@ -0,0 +1,15 @@
+module Mom
+  class Statement
+    include Common::List
+    # flattening will change the structure from a tree to a linked list (and use
+    # nekst to do so)
+    def flatten(options = {})
+      raise "not implemented for #{self}"
+    end
+  end
+
+end
+
+require_relative "statements"
+require_relative "if_statement"
+require_relative "while_statement"

lib/mom/statement/statements.rb

@@ -1,13 +1,4 @@
 module Mom
-  class Statement
-    include Common::List
-    # flattening will change the structure from a tree to a linked list (and use
-    # nekst to do so)
-    def flatten(options = {})
-      raise "not implemented for #{self}"
-    end
-  end
-
   class Statements < Statement
     include Common::Statements
 
@@ -26,8 +17,4 @@ module Mom
       }
     end
   end
-
 end
-
-require_relative "if_statement"
-require_relative "while_statement"