Add Event Sources:event_sources

- Add source property in Action and EventFilter
- Change TPropContainer contructor to accept keyword arguments and set
  properties that were given
- Change every single TPropContainer subclass constructor to accept
  kwargs and pass them on to super init
- Add a "null" option for TStringProperty
Use Event Sources:
- Make the probe require a source property to install or subscribe
- Have ProbeProxy install and subscribe return a prefixed address
- Make update, uninstall and unsubsribe extract the prefix from the
  address
- Have the TutorialRunner set a source on actions/events before
  installing/subscribing instead of setting current activity on
  ProbeManager
Test Event Sources:
- Change the tests according to the new constructors and behaviors

1 files changed, 3 insertions, 3 deletions

diff --git a/tutorius/filters.py b/tutorius/filters.py
index 38cf86b..6ef8867 100644
--- a/tutorius/filters.py
+++ b/tutorius/filters.py
@@ -25,12 +25,12 @@ class EventFilter(properties.TPropContainer):
     """
     Base class for an event filter
     """
-
-    def __init__(self):
+    source = properties.TStringProperty(None, null=True)
+    def __init__(self, **kwargs):
         """
         Constructor.
         """
-        super(EventFilter, self).__init__()
+        super(EventFilter, self).__init__(**kwargs)
         self._callback = None
 
     def install_handlers(self, callback, **kwargs):