add an npm-like UI

This is actually pretty damn cool:

![screenshot 2014-08-10 16 55 47](https://cloud.githubusercontent.com/assets/283842/3870473/cf4278b2-20d0-11e4-93a9-cda0bd07b59f.png)
![screenshot 2014-08-10 16 55 53](https://cloud.githubusercontent.com/assets/283842/3870474/cf4330c2-20d0-11e4-9cde-6f9679e93397.png)

Just basically copy-pasted from the npm-browser, removing all the replication-related stuff. It doesn't replicate to the browser; it just uses the local-npm skimdb itself.