Added back session rewrite for backwards compatibility (#190)

Author: alexherbs

app/code/community/Cm/RedisSession/etc/config.xml

@@ -38,6 +38,11 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   </modules>
   <global>
     <models>
+      <core_resource>
+        <rewrite>
+          <session>Cm_RedisSession_Model_Session</session>
+        </rewrite>
+      </core_resource>
       <cm_redissession>
         <class>Cm_RedisSession_Model</class>
       </cm_redissession>