[Thilo Molitor] Ability to separate plugins dir when using -s option.

plugin_installer/manifest.ini

 [info]
 name: Plugin Installer
 short_name: plugin_installer
-version: 0.20.0
+version: 0.20.1
 description: Install and upgrade plugins from ftp
 authors: Denis Fomin <fominde@gmail.com>
  Yann Leboulanger <asterix@lagaule.org>

plugin_installer/plugin_installer.py

@@ -528,7 +528,7 @@ class DownloadAsync(threading.Thread):
             local_dir = os.path.join(user_dir, remote_dir)
             if not os.path.isdir(local_dir):
                 os.mkdir(local_dir)
-            local_dir = os.path.split(user_dir)[0]
+            local_dir = os.path.dirname(local_dir)
 
             # downloading zip file
             try:
@@ -538,7 +538,7 @@ class DownloadAsync(threading.Thread):
                 log.exception("Error downloading plugin %s" % filename)
                 continue
             with ZipFile(buf) as zip_file:
-                zip_file.extractall(os.path.join(local_dir, 'plugins'))
+                zip_file.extractall(local_dir)
         GLib.idle_add(self.plugin.on_plugin_downloaded, self.remote_dirs)