New versions of SQLAlchemy in requirements

Version of SQLAlchemy changed to 0.9.
Version of sqlalchemy-migrate changed to 0.9.
Function cast in models was fixed.

Change-Id: I4f4c5631d792ff921a3f1a52b7faa5bb4aa462db

requirements.txt

@@ -13,9 +13,9 @@ python-openid
 PyYAML>=3.1.0
 requests>=1.1
 six>=1.7.0
-SQLAlchemy>=0.8,<=0.8.99
+SQLAlchemy>=0.9.7,<=0.9.99
 WSME>=0.6
-sqlalchemy-migrate>=0.8.2,!=0.8.4
+sqlalchemy-migrate>=0.9.1,!=0.9.2
 SQLAlchemy-FullText-Search
 eventlet>=0.13.0
 stevedore>=1.0.0

storyboard/db/models.py

@@ -340,7 +340,7 @@ def _story_build_summary_query():
         ).label('status')
     )
     for task_status in Task.TASK_STATUSES:
-        select_items.append(func.cast(
+        select_items.append(expr.cast(
             func.sum(Task.status == task_status), Integer
         ).label(task_status))
     select_items.append(expr.null().label('task_statuses'))