Update WP_Bootstrap to allow multiple wp-bootstrap.com to contain only a single value for 'config'

[mikeschinkel]

For example:

<?php
return array(
	'config' => '/app/config',
);

And:

<?php
return array(
	'config' => '/content/config',
);

And (although this would be redundant since it is the default):

<?php
return array(
	'config' => '/wp-content/config',
);