Get rid of the 2.4 annotations in TODO.

TODO

@@ -9,10 +9,10 @@
     Don't forget docs
   Using helpers
     haml_concat and haml_tag in particular
-  [2.4] Syntax highlighting?
+  Syntax highlighting?
 
 * Code
-  [2.4] Keep track of error offsets everywhere
+  Keep track of error offsets everywhere
     Use this to show error location in messages
     Just clean up SassScript syntax errors in general
     Lexer errors in particular are icky
@@ -22,10 +22,8 @@
      I think we can just wrap interpolated code with (),
      since it's already interpolated.
    Can also use () to wrap contents of _haml_temp so that commas throw errors when not in :ugly
-   [2.4] Support finer-grained HTML-escaping in filters
-   [2.4] Allow "!!! HTML5" to set :format => :html5 ?
-     How do we deal with partials?
-   [2.4] :ugly + :html improvements
+   Support finer-grained HTML-escaping in filters
+   :ugly + :html improvements
      Ignore closing tags where we can
        http://code.google.com/speed/articles/optimizing-html.html
        Requires Haml parsing refactor
@@ -36,15 +34,15 @@
    Benchmark the effects of storing the raw template in sassc
      If it's expensive, overload RootNode dumping/loading to dup and set @template to nil
      Then fall back on reading from actual file
-   [2.4] CSS superset
-   [2.4] Classes are mixins
+   CSS superset
+   Classes are mixins
      Can refer to specific property values? Syntax?
-   [2.4] Pre-parse everything possible: never call Node#interpolate
-   [2.4] Do all parsing in to_tree
-   [2.4] Pull in Compass watcher stuff
-   [2.4] Internationalization
+   Pre-parse everything possible: never call Node#interpolate
+   Do all parsing in to_tree
+   Pull in Compass watcher stuff
+   Internationalization
      Particularly word constituents in Regexps
-   [2.4] Optimization
+   Optimization
      http://csstidy.sourceforge.net/
      http://developer.yahoo.com/yui/compressor/
      Also comma-folding identical rules where possible