npm-typeahead search experiment

![screen shot 2014-05-30 at 2 31 13 pm](https://cloud.githubusercontent.com/assets/194609/3134663/bd005722-e828-11e3-90db-5e83c9fc3b54.png)

* pulled in my npm-typeahead experiment, which adds typeahead search to the npm-search box.
* pulled in Browserify.
  * npm-typeahead was built using browseify, which I've pulled in as a dev-dependency.
* I also found, and fixed the problem with search not working on iOS, it turned out to be a global style being applied to `input`.