This commit introduces two main visual changes:
1. The purples have been changed to the colours that
we already use on the current php.net.
2. Link colour changed from green to blue.
(auto-expanded) mega drop-down as per mock-up sent to the mailing list.
The top-portion of the mock-up was generally well received. The lower-portion
needs additional work. This change only commits the top portion. Some minor
changes were made to incorporate feedback and tidy things up.
index.php to pass 'current' => 'home' when calling the header. Updated
header.inc to set the current class on the logo when on the home page.
Adjusted CSS rules to apply the darker bottom border to the logo.
Made the mega drop-down background color a touch lighter.
