Breakpoint toggle giving issues in OSX

Hello,

I really like this plugin. I've tried to use it and I think I've found a bug.

When I try to set a breakpoint in a file with a big path locations it shortens the path causing troubles.

Here is an example:

```
/var/www/wordpress/wp-content/plugins/woocommerce/templates/conten ... duct.php
```

Screenshot of codebug:
http://gyazo.com/664b2b94c181622b53cb3f61d74ca314

Thanks,
Pedro
