replace jquery-ui autocomplete with typeahead.js

[jcoyne]

https://twitter.github.io/typeahead.js/examples/

[carolyncole]

@jcoyne What is the reason for the change? Does this fix any bugs, or just better technology?

[mjgiarlo]

@jcoyne Can you provide a brief rationale for this change? Either that or close the issue.

[hackartisan]

I've played around with this locally. My primary use case is providing 2 different authority sources as autocomplete options on the same autocomplete dropdown. Unfortunately typeahead doesn't come with any styling and I didn't get it to work right before I needed to move on, so I currently don't have anything to contribute back.

[mjgiarlo]

No rationale, so I am closing for now.

[jcoyne]

Rational: Use for multiple sources.