Make Quips npm-link-able (while still hem-friendly)

- Shuffled primary codebase to ./lib
- Changed "main" in package.json to point to ./index.coffee
- Reworked imports in ./index.coffee
- Upgraded a few dependencies like coffee-script and hem
Merge pull request #11 from markchadwick/linkable

Make Quips npm-link-able (while still hem-friendly)