Search box on front page below the map should search people and organizations

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Currently, the search box on the front page of spacebase.co performs a full text search without people and organizations selected. This results in poor search results. Instead, it should search the directory (group and user datasources).

So a search for "asdf" should pull up the page:

http://spacebase.co/search?search_api_fulltext=asdf&search_api_datasource%5Bentity%3Agroup%5D=entity%3Agroup&search_api_datasource%5Bentity%3Auser%5D=entity%3Auser