generate FORMA table for GFW on CartoDB

Instead of transforming the common data model using SQL, as we have been doing (with dire effects on our production database!), use Cascalog to generate zoom levels all in one go. [Recursive `gen-tiles`](https://github.com/wri/forma-clj/compare/feature;fix-updates?expand=1#diff-1f5803f19bd04822e0625d314e00fe08R198) with Cascalog makes this so simple!