CHILD_DIR and CHILD_URL conflict with the Genesis framework

I stumbled upon this earlier this evening. I fixed it locally and thought I would let you guys know too. I was receiving the warning which I figured I would live with, but each time I saved a change in the WP admin it would give me errors.

I did just update both to Wordpress 3.8 and the placester plugin to 1.1.26

These are the warnings I received on every page

```
Notice: Constant CHILD_DIR already defined in /Users/nick/Projects/wordpress/placester_demo/wp-content/plugins/placester/blueprint/blueprint.php on line 202

Notice: Constant CHILD_URL already defined in /Users/nick/Projects/wordpress/placester_demo/wp-content/plugins/placester/blueprint/blueprint.php on line 203
```

And these are the warnings I received when I saved a setting from the wp admin

```
Warning: Cannot modify header information - headers already sent by (output started at /Users/nick/Projects/wordpress/placester_demo/wp-content/plugins/placester/blueprint/blueprint.php:202) in /Users/nick/Projects/wordpress/placester_demo/wp-admin/post.php on line 229

Warning: Cannot modify header information - headers already sent by (output started at /Users/nick/Projects/wordpress/placester_demo/wp-content/plugins/placester/blueprint/blueprint.php:202) in /Users/nick/Projects/wordpress/placester_demo/wp-includes/pluggable.php on line 8
```