Add forgotten exports

pydtn/__init__.py

 """pydtn is a module for simulating delay tolerant networks."""
 
 __all__ = [
-    'Contact',
-    'Traffic',
-
     'Network',
     'Buffer',
 
     'Node',
     'EpidemicNode',
+    'FloodingNode',
+
+    'Contact',
+    'csv_trace',
+    'random_trace',
+
+    'Traffic',
+    'random_traffic',
 ]
 __version__ = '0.1'
 __author__ = 'Jarrod Pas <j.pas@usask.ca>'