Implemented font-weight optimization

Makefile

 RESULT    := mincss
 PRE_TGTS  := types
 MODULES   := color_names util stringify parser lexer parse selector color \
-             shorthand duplicates main
+             shorthand duplicates font main
 ALL_NAMES := $(PRE_TGTS) $(MODULES)
 
 OCAMLCFLAGS  := -g
@@ -36,7 +36,7 @@ lexer.cmi: lexer.ml
 parser.cmx: parser.cmi lexer.cmx
 parser.mli: parser.ml
 parse.cmx: lexer.cmi parser.cmx
-main.cmx: parse.cmx util.cmx color.cmx shorthand.cmx duplicates.cmx
+main.cmx: parse.cmx util.cmx color.cmx shorthand.cmx duplicates.cmx font.cmx
 util.cmx: OCAMLCFLAGS += -pp cpp
 util.cmx color.cmx: color_names.cmx
 stringify.cmx parser.cmx color.cmx shorthand.cmx: util.cmi

main.ml

@@ -131,11 +131,11 @@ let handle_args args =
   let input, css = parse_files args.infiles in
   let css = css
     |> switch args.color Color.compress
-    (*|> switch args.font Font.compress*)
 
     (* unfold before pruning duplicates so that shorthand components are
      * correctly pruned *)
     |> switch args.shorthands Shorthand.unfold_stylesheet
+    |> switch args.font Font.compress
     |> switch args.duplicates Duplicates.compress
     |> switch args.shorthands Shorthand.compress
   in