extra Window elements: monday and shown_projects

Window.py

@@ -1,10 +1,14 @@
 
 import gtk
 import gobject
+from datetime import *
 
 class Window:
     def __init__(self, ds):
         self.ds = ds
+        self.shown_projects = []
+        now = datetime.now()
+        self.monday = now.date() - timedelta(now.weekday())
 
         # Top-level Window creation
         self.window = gtk.Window(gtk.WINDOW_TOPLEVEL)