Update to jQuery 3.2.0

Update to jQuery 3.1.1.

Merge branch 'autocomplete' of git://github.com/mamarley/quassel-rest-search into mamarley-autocomplete

Add .htaccess file

This blocks access to the .gitignore and qrs_config.php files and
the .git directory.

The page already provides an autocomplete mechanism, so this patch
prevents the browser autocomplete dropdown from being displayed if
the search box is clicked twice.

Use the material-design-icons directly from Google's git repository

Google has a version of the material icons specifically intended
for self-hosting at
https://github.com/google/material-design-icons/tree/master/iconfont,
so use these files instead.  The CSS file is, however, modified to
remove the .eot font since this is only used by IE <9, which is
unsupported anyway.  This also adds .woff and .woff2 fonts which
are much smaller and save bandwidth when using modern browsers.