[UP-4060]  Show the configure screen in a lightbox instead of displaying...

... it inline.

Limitations:
- only works for single page configurations.   Since, I believe that is normal for config pages anyhow, I think this is probably OK.   
- will not work correctly on config screens where form action or link hrefs are set at runtime w/ javascript.  I'm not aware of any existing portlets that do this.

Screens:
Lightbox being used to configure the portal-logo region in the header area:
![lightbox-for-region](https://cloud.githubusercontent.com/assets/7871998/4776865/efc92816-5bc6-11e4-9309-a08ecc612b6b.png)

Lightbox being used to configure the email preview portlet in the content area:
![lightbox-for-content](https://cloud.githubusercontent.com/assets/7871998/4776867/f3d8146c-5bc6-11e4-90d8-6f0b58a2ec5e.png)