Update ruby-haml package to 3.0.24.

3.0.24

Tagged on GitHub.

    * html2haml now properly generates Haml for silent script expressions
      nested within blocks.
    * IronRuby compatibility. This is sort of a hack: IronRuby reports its
      version as 1.9, but it doesn’t support the encoding APIs, so we treat
      it as 1.8 instead.

3.0.23

Tagged on GitHub.

    * Fix the error message for unloadable modules when running the
      executables under Ruby 1.9.2.
    * Fix an error when combining old-style and new-style attributes.

3.0.22

Tagged on GitHub.

    * Allow an empty line after case but before when.
    * Remove vendor/sass, which snuck into the gem by mistake and was causing
      trouble for Heroku users (thanks to Jacques Crocker).
    * Support the Rails 3.1 template handler API.

3.0.21

Tagged on GitHub.

    * Fix the permissions errors for good.

3.0.20

Tagged on GitHub.

    * Fix some permissions errors.

3.0.19

Tagged on GitHub.

    * Fix the :encoding option under Ruby 1.9.2.
    * Fix interpolated if statement when HTML escaping is enabled.
    * Allow the --unix-newlines flag to work on Unix, where it’s a no-op.

(taca)