Search with typeahead

Switched everything over to use Typeahead.js and Bloodhound.js. Tried to keep proper formatting intact, but a second look would be appreciated. Will post screenshots as well. 
Instead of animating both `.search-div` and `.twitter-typeahead`, I believe you can set the `.twitter-typeahead` element to `width: 100%` in the SCSS file and just animate `.search-div`.