Add:
        templates/index.html, static/(js/index.advanced-search-form.js,
        sass/index.sass)
                -Add a "submit" button to the advanced search form, with styling
                and appropriate callbacks.

Add:
        static/js/index.advanced-search-form.js
                -Fix lack of drop-down autocompletion in new `language` fields.
                -Change the names displayed next to input fields to match those
                present in the sidebar.

Add:
    static/sass/index.sass
        -Add style rules to fix bugs, and improve the appearance of some minor
        details.

    static/js/index.advanced-search-form.js
        -Close #41. Add statements to scroll to the bottom of the search-groups
        div when any search-groups/input fields are added.

Fix:
    bitshift/languages.py
        -Python's `u"string"` unicode specifier results in a Javascript syntax
        error when pasted verbatim into `templates/index.html` by Flask; add
        `str()` to the languages array loader to fix it.

Add:
    static/js/index.advanced-search-form.js
        -Prevent the user from removing the last input field in an
        advanced-search group.

Rem:
    templates/index.html
        -Remove vestige code accidentally preserved during the c6e5b4f merge.

Add:
    templates/index.html, static/js/index.advanced-search-form.js
        -Remove commented-out code, `testQueryStringGeneration()`, etc.; prepare
        for merging into `develop`.

    static/js/advanced-search-form.js
        -Perform a live update of the main query bar with a user's inputs in the
        advanced search form.

Add:
    static/js/index.advanced-search-form.js, static/sass/index.sass,
    static/css/lib/jqueryui.custom.min.css
        -Add `jQuery UI` autocompletion menu to the advanced-search form's
        language input field, to replace `twitter typeahead` (which was
        incompatible with the new form's style rules).

    static/js/index.advanced-search-form.js
        -Add regex field specifier to query string.

Add:
    static/js/index.advanced-search-form.js
        -Add `assembleQuery()`, which constructs a query string from the
        contents of the fields of the advanced search form's search groups.

Add:
    static/js/(index > index.advanced-search-form).js
        -Migrate code relevant to the advanced search form to its own file.
        -Group global-scope function calls into wrapper functions executed on
        definition.
        -Add datepicker to new form's input fields.