Version 0.4.1

Changes:
winmenu: Activate the window's workspace when activating a window menu item.
Allow filer windows im winmenu to be dragged as text/uri-list.
Expose winmenu.get_filer_window_path().
Function to install applets as XFCE panel plugins.
Make WinIcon and WinIconManager work without libwnck.
WinIcon: Expose windows attributes.
Fixed WinIconManager.
Removed findrox import.