GRN-19: Add confirmation for accepting cookies from the site (#345)

* Added a cookie warning

* Cleaned up code to better match application standard

app/assets/javascripts/cookies.js

@@ -0,0 +1,27 @@
+// BigBlueButton open source conferencing system - http://www.bigbluebutton.org/.
+//
+// Copyright (c) 2018 BigBlueButton Inc. and by respective authors (see below).
+//
+// This program is free software; you can redistribute it and/or modify it under the
+// terms of the GNU Lesser General Public License as published by the Free Software
+// Foundation; either version 3.0 of the License, or (at your option) any later
+// version.
+//
+// BigBlueButton is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+// PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License along
+// with BigBlueButton; if not, see <http://www.gnu.org/licenses/>.
+
+$(document).ready(function() {
+  $("#cookies-agree-button").click(function() {
+    //create a cookie that lasts 1 year
+    var cookieDate = new Date();
+    cookieDate.setFullYear(cookieDate.getFullYear() + 1); //1 year from now
+    document.cookie = "cookie_consented=true; path=/; expires=" + cookieDate.toUTCString() + ";"
+
+    //hide the banner at the bottom
+    $(".cookies-banner").attr("style","display:none !important")
+  })
+})