Automatically doge ALL string descriptions

Well this is all kinds of Terrible Idea™, but that's why we're here, right?

```
NSLog(@"%@", @"swizzled description");
```
gives
```
2014-06-19 17:53:05.140 NSDogeString[5249:211659] such swizzled description. wow.
```

There's a few gross hacks in there to prevent recursion and multi-dogeing that could probably be nicer, but it seems to work a-okay as is.

![](http://i.imgur.com/jC50pkz.jpg)