Added download-all feature without instanceconfig

The button to download all the files in a thread only appears when the
page is a thread, such as treeview.
I added the download-all button next
to the treeview one.
I modified stylesheets/v8ch.css to include the id
#download-all.
I DIDN'T modified inc/instance-config.php to include the
download-all.js and jszip.min.js. That goes in the next commit.

I added the files js/jszip.min.js
which is a library to work with zip files in JS and I added
js/download-all.js which goes through all files, adds them to a zip and
then gives it to the user.

js/download-all.js

@@ -0,0 +1,29 @@
+
+if(active_page=='thread')
+
+$(function (){
+
+$('hr:first').before('<div id="download-all" style="text-align:right"><a class="unimportant" href="javascript:void(0)"></a></div>');
+        $('div#download-all a')
+                .text(_('Download All'))
+                .click(function() {
+
+
+	var zip = new JSZip();
+	var files = document.getElementsByClassName("fileinfo");
+	for(var i = 0; i < files.length; i++)
+	{
+		for(var j = 0; j < files.length; j++)
+		{
+			x = 'http://8chan.co/' + files[i].getElementsByTagName('a')[j].src;
+			zip.file(x);
+		}		
+	}
+
+
+var content = zip.generate({type:"blob"});
+var fns = document.URL.split('/');
+var fn = fns[2] + '/' + fns[4].substring(0, fns[4].length-5);
+saveAs(content, fn);
+
+})})

stylesheets/v8ch.css

@@ -76,7 +76,8 @@ form table tr th{
   color: #fff !important;
   background: #222 !important;
 }
- 
+
+#download-all,
 #expand-all-images,
 #shrink-all-images,
 #treeview{
@@ -96,6 +97,10 @@ form table tr th{
   margin-top: 6em !important;
 }
  
+#download-all{
+  margin-top: 7em !important;
+}
+
 #expand-all-images + hr,
 #shrink-all-images + hr{
   opacity: 0 !important;
@@ -107,6 +112,11 @@ form table tr th{
   clear: both !important;
 }
  
+#download-all + hr{
+  opacity: 0 !important;
+  clear: both !important;
+}
+
 #options_handler{
   margin-top: 3em !important;
 }