Remove need for encoding-indexes.js, trim bits of lodash.js we don't need. Fixes #57

This takes us down to 94K from 600K:

```
-rw-r--r--   1 dave  staff   205K  2 Dec 15:08 idbfs.js
-rw-r--r--   1 dave  staff    94K  2 Dec 15:08 idbfs.min.js
```