Added dev:resolve command

Loving the tool and I would like to propose adding a dev:resolve command which basically just resolves your grouped class name (catalog/product) with type model, helper or block to a class name (Mage_Catalog_Model_Product or when it has a rewrite Rk_Test_Model_Product).
I feel like this could be very useful to quickly debug your rewrites or find out what a block type in your layout resolves to.
![screenshot from 2013-06-12 22 07 37](https://f.cloud.github.com/assets/1918518/645028/e5d1ce26-d39b-11e2-811d-b00170319a7a.png)