[#730] Add tracking_raw_table to model

The tracking_raw table was being created by a migration script, but was
not actually defined anywhere in ckan's model. This means that in tests,
ckan.model.rebuild_db() would not clear the tracking_raw table, and the
old data would then leak it into tracking_summary as well. Adding
tracking_raw to the model makes rebuild_db() behave as expected again.

ckan/model/__init__.py

@@ -101,6 +101,7 @@
 from tracking import (
     tracking_summary_table,
     TrackingSummary,
+    tracking_raw_table
 )
 from rating import (
     Rating,

ckan/model/tracking.py

@@ -3,7 +3,15 @@
 import meta
 import domain_object
 
-__all__ = ['tracking_summary_table', 'TrackingSummary']
+__all__ = ['tracking_summary_table', 'TrackingSummary', 'tracking_raw_table']
+
+tracking_raw_table = Table('tracking_raw', meta.metadata,
+        Column('user_key', types.Unicode(100), nullable=False),
+        Column('url', types.UnicodeText, nullable=False),
+        Column('tracking_type', types.Unicode(10), nullable=False),
+        Column('access_timestamp', types.DateTime),
+    )
+
 
 tracking_summary_table = Table('tracking_summary', meta.metadata,
         Column('url', types.UnicodeText, primary_key=True, nullable=False),