Add MongoSmash to Other Notable Projects for node.js

Hi there! This adds [MongoSmash](https://github.com/bengl/mongosmash), a MongoDB ODM I've been working on for Node.js that uses ES6/Harmony features. It's in a working/usable state right now, so thought it might be OK for inclusion on this page.

If a certain degree of stability or popularity is necessary to be included here, that's fine.