Allow WordPress to store wp-content outside of main wp directory

WP allows the wp-content directory to be outside the main WP directory. This works fine for everything except cli/cron jobs. Check:

http://codex.wordpress.org/Editing_wp-config.php#Moving_wp-content

We need to let Civi know where WP is located. Since this does not seem to be too common a case, one short term fix is to add a: CIVICRM_CMSDIR setting in settings_location.php. This allows sites with this structure to continue working as normal.

I've added documentation for this here:

http://wiki.civicrm.org/confluence/pages/viewpage.action?pageId=83034188