Add email templates for user notifications and account management

- Created a base email template (base.html) for consistent styling across all emails.
- Added moderation approval email template (moderation_approved.html) to notify users of approved submissions.
- Added moderation rejection email template (moderation_rejected.html) to inform users of required changes for their submissions.
- Created password reset email template (password_reset.html) for users requesting to reset their passwords.
- Developed a welcome email template (welcome.html) to greet new users and provide account details and tips for using ThrillWiki.

django/staticfiles/django_extensions/js/jquery.bgiframe.js

@@ -0,0 +1,39 @@
+/*! Copyright (c) 2010 Brandon Aaron (http://brandon.aaron.sh/)
+ * Licensed under the MIT License (LICENSE.txt).
+ *
+ * Version 2.1.2
+ */
+
+(function($){
+
+$.fn.bgiframe = ($.browser.msie && /msie 6\.0/i.test(navigator.userAgent) ? function(s) {
+    s = $.extend({
+        top     : 'auto', // auto == .currentStyle.borderTopWidth
+        left    : 'auto', // auto == .currentStyle.borderLeftWidth
+        width   : 'auto', // auto == offsetWidth
+        height  : 'auto', // auto == offsetHeight
+        opacity : true,
+        src     : 'javascript:false;'
+    }, s);
+    var html = '<iframe class="bgiframe"frameborder="0"tabindex="-1"src="'+s.src+'"'+
+                   'style="display:block;position:absolute;z-index:-1;'+
+                       (s.opacity !== false?'filter:Alpha(Opacity=\'0\');':'')+
+                       'top:'+(s.top=='auto'?'expression(((parseInt(this.parentNode.currentStyle.borderTopWidth)||0)*-1)+\'px\')':prop(s.top))+';'+
+                       'left:'+(s.left=='auto'?'expression(((parseInt(this.parentNode.currentStyle.borderLeftWidth)||0)*-1)+\'px\')':prop(s.left))+';'+
+                       'width:'+(s.width=='auto'?'expression(this.parentNode.offsetWidth+\'px\')':prop(s.width))+';'+
+                       'height:'+(s.height=='auto'?'expression(this.parentNode.offsetHeight+\'px\')':prop(s.height))+';'+
+                '"/>';
+    return this.each(function() {
+        if ( $(this).children('iframe.bgiframe').length === 0 )
+            this.insertBefore( document.createElement(html), this.firstChild );
+    });
+} : function() { return this; });
+
+// old alias
+$.fn.bgIframe = $.fn.bgiframe;
+
+function prop(n) {
+    return n && n.constructor === Number ? n + 'px' : n;
+}
+
+})((typeof window.jQuery == 'undefined' && typeof window.django != 'undefined') ? django.jQuery : jQuery);