[dev] klutz default driver

[Matt Selsky]

I set imageExists() and storeImage() to both return true and updated the 
phpdoc accordingly.

> Should imageExists() and storageImage() both return true in the default 
> storage driver?  Images aren't actually stored locally, but we probably 
> want to pretend that they are.
> 
> Sorry, I'm just a little confused because the phpdoc doesn't agreed with 
> the implementation...

-- 
Matt