Commit for review - Multiple pages in designer

This pull request includes work I've done so far for managing multiple pages from the Designer. Please review the code and give feedback on what has been so far. Meanwhile, I'll continue to complete the functionalities.

Signed-off-by: Bimal Yashodha <kb.yashodha@gmail.com>
I add the same changes done in themes/pmahomme/css/pmd.css.php to themes/metro/css/pmd.css.php