Keep repo minimal.

Now that I understand npm a little bit better I see why many authors
don't store `lib` and `dist` in the GitHub repo. These items are
generated on the fly using the `prepublish` hook and included in the npm
module. But they don't need to be stored in the GitHub repo.

I'm about 90% sure that's accurate at least.

Author: danott

.gitignore

@@ -1,2 +1,4 @@
+dist
+lib
 node_modules
 npm-debug.log