WP_PLUGIN_DIR define collision

Hi,

There’s a define on line 15 of ajax.php which is causing an error for me. On local I define this up-front to avoid too much DB wrangling, so when the plugin redefines it I get a Notice level error, which (because I’m local and have WP_DEBUG true) breaks the resulting JS file.

Simple fix:

if (!defined('WP_PLUGIN_DIR')) {
    define( 'WP_PLUGIN_DIR', WP_CONTENT_DIR . '/plugins' ); // full path, no trailing slash
}

I’ve put this in my local copy but would be great if you could merge it into the plugin so my ridiculous edge-case don’t get clobbered with the next upgrade?

Ta very much!

( Couldn’t find how to send a pull request!)

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