Corrected 'wp-*.php' to '/wp-*.php'

Without '/', the rule on line 2 ignores any files that match throughout the tree, including plugin files.

Two plugins affected by this issue in my current project are:

WP-Typography (http://wordpress.org/extend/plugins/wp-typography/)
_wp-typography.php_

Twitter-Widget-Pro (http://wordpress.org/extend/plugins/twitter-widget-pro/)
_wp-twitter-widget.php_

With '/' at the beginning we ignore only those matching files at the root of the repo.