Support CSRF_COOKIE_NAME

Added support for custom CSRF_COOKIE_NAME by refactoring the jquery.django-csrf.js file into a separate .html file that can be used as an include, passing in the CSRF_COOKIE_NAME from settings.

adminsortable/static/adminsortable/js/jquery.django-csrf.js

@@ -1,32 +0,0 @@
-// using jQuery
-function getCookie(name) {
-    var cookieValue = null;
-    if (document.cookie && document.cookie !== '') {
-        var cookies = document.cookie.split(';');
-        for (var i = 0; i < cookies.length; i++) {
-            var cookie = django.jQuery.trim(cookies[i]);
-            // Does this cookie string begin with the name we want?
-            if (cookie.substring(0, name.length + 1) === (name + '=')) {
-                cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
-                break;
-            }
-        }
-    }
-    return cookieValue;
-}
-
-var csrftoken = getCookie('csrftoken');
-
-function csrfSafeMethod(method) {
-    // these HTTP methods do not require CSRF protection
-    return (/^(GET|HEAD|OPTIONS|TRACE)$/.test(method));
-}
-
-django.jQuery.ajaxSetup({
-    crossDomain: false, // obviates need for sameOrigin test
-    beforeSend: function(xhr, settings) {
-        if (!csrfSafeMethod(settings.type)) {
-            xhr.setRequestHeader("X-CSRFToken", csrftoken);
-        }
-    }
-});