Don't use the newer versions of django, djangorestframework and django-rest-swagger

There has been API changes in the latest versions that will requires some work in the
beat.web codebase

buildout.cfg

@@ -15,10 +15,10 @@ develop = .
 versions = versions
 
 [versions]
-django = >=1.8
-django-rest-swagger = >=0.3.2
+django = >=1.8,<1.9
+django-rest-swagger = >=0.3.2,<0.3.3
 django-guardian = >=1.3
-djangorestframework = >=3.2
+djangorestframework = >=3.2,<3.3
 django-activity-stream = >= 0.6.0
 
 [sysegg]