adding change warning to all doc pages

docs/index.rst

@@ -5,6 +5,10 @@
 cqlengine documentation
 =======================
 
+**Users of versions < 0.4, please read this post before upgrading:** `Breaking Changes`_
+
+.. _Breaking Changes: https://groups.google.com/forum/?fromgroups#!topic/cqlengine-users/erkSNe1JwuU
+
 cqlengine is a Cassandra CQL 3 Object Mapper for Python with an interface similar to the Django orm and mongoengine
 
 :ref:`getting-started`

docs/topics/columns.rst

@@ -2,6 +2,10 @@
 Columns
 =======
 
+**Users of versions < 0.4, please read this post before upgrading:** `Breaking Changes`_
+
+.. _Breaking Changes: https://groups.google.com/forum/?fromgroups#!topic/cqlengine-users/erkSNe1JwuU
+
 .. module:: cqlengine.columns
 
 .. class:: Bytes()

docs/topics/connection.rst

@@ -2,6 +2,10 @@
 Connection
 ==============
 
+**Users of versions < 0.4, please read this post before upgrading:** `Breaking Changes`_
+
+.. _Breaking Changes: https://groups.google.com/forum/?fromgroups#!topic/cqlengine-users/erkSNe1JwuU
+
 .. module:: cqlengine.connection
 
 The setup function in `cqlengine.connection` records the Cassandra servers to connect to.

docs/topics/manage_schemas.rst

@@ -2,6 +2,12 @@
 Managing Schmas
 ===============
 
+**Users of versions < 0.4, please read this post before upgrading:** `Breaking Changes`_
+
+.. _Breaking Changes: https://groups.google.com/forum/?fromgroups#!topic/cqlengine-users/erkSNe1JwuU
+
+.. module:: cqlengine.connection
+
 .. module:: cqlengine.management
 
 Once a connection has been made to Cassandra, you can use the functions in ``cqlengine.management`` to create and delete keyspaces, as well as create and delete tables for defined models

docs/topics/models.rst

@@ -2,6 +2,12 @@
 Models
 ======
 
+**Users of versions < 0.4, please read this post before upgrading:** `Breaking Changes`_
+
+.. _Breaking Changes: https://groups.google.com/forum/?fromgroups#!topic/cqlengine-users/erkSNe1JwuU
+
+.. module:: cqlengine.connection
+
 .. module:: cqlengine.models
 
 A model is a python class representing a CQL table.

docs/topics/queryset.rst

@@ -2,6 +2,12 @@
 Making Queries
 ==============
 
+**Users of versions < 0.4, please read this post before upgrading:** `Breaking Changes`_
+
+.. _Breaking Changes: https://groups.google.com/forum/?fromgroups#!topic/cqlengine-users/erkSNe1JwuU
+
+.. module:: cqlengine.connection
+
 .. module:: cqlengine.query
 
 Retrieving objects