Update Gem list
Load twitter typeahead
Add sample typeahead to query_box and style it
Install active_model_serializer
Add Concepts controller and views
Configure how serializer render data
Render concepts as json for typeahead
Add concept type-ahead and style
Add id to json list of concepts (for typeahead)
Style the default search box
Get concepts.json first and use it as local for typeahead to get id after selection
Handle both autocomplete & select event in typeahead
Add hidden_field to store query's concept.id and redirect it to the search controller
Merge branch 'add_typeahead_for_concept' into development