Make https://npmjs.org/package/<% name %> case-insensitive

In Node, `require` parameters are case-insensitive (at least on Mac and Windows). In other words, these all have the same effect:

```js
require('lodash.forownright');
require('lodash.forOwnRight');
require('LoDaSh.fOrOwNRiGhT');
```

Because of this, it would make sense to make the package name in URLs like https://npmjs.org/package/lodash.forownright case-insensitive, too. This would make e.g. https://npmjs.org/package/lodash.forOwnRight work instead of 404ing.