Add deprecation message information

Hey @redmunds, I think this is what was missing about the `@deprecated` tag for #41.

I couldn't bring myself to show the diagonal stripes on the header... or at least not gracefully enough :smile: 

This is what I could bring myself to do... @larz0 what do you think? Something we could do here? You left everything so beautiful that it hurts me to spoil it like this:

![screen shot 2014-06-10 at 12 26 19 am](https://cloud.githubusercontent.com/assets/905006/3223628/229ba39e-f025-11e3-9a91-bc89ac343aa9.png)
![screen shot 2014-06-10 at 12 27 00 am](https://cloud.githubusercontent.com/assets/905006/3223634/37afae2e-f025-11e3-9c27-f0087aa0f9e6.png)