Draft working version of autocompletion for sites field using typeahead library.
Changing to using jQuery UI's autocompletion library.
Added to validation: require presence of date and access_level and all
foreign keys except cultivar_id and method_id.
Make access_level input field a select box.
Upgraded jquery to version 1.11.0 and added jquery-migrate to
facilitate backwards-compatibility with existing code.

Added jquery-ui libraries to get date-picker and autocompletion library.

Include lazy/bulk_upload.js on bulk-upload pages.
Committing all files for first complete draft of autocompletion for
bulk upload wizard.  Filtering of results now happens server-side.