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+Tracked fields
+---------------
+Tracked fields is generic logging system for the changes applied to some fields in open chatter.
+ - In the definition of a fields. you have to simply add tracked=True.
+ - When changing one of the fields having tracked=True on saved automatically write a log in openchatter for the changes in fields.
+
+How it works:
++++++++++++++
+ - You have to add tracked=True in field defination as following.
+ - ``'stage_id': fields.many2one('project.task.type', 'Stage',tracked=True),``
+ - For developed this feature we override write method of mail_thread. 
+ - And make one mako template which shows old field and updated field.
+ 
+Open chatter log:
++++++++++++++++++
+ - After changing field follower can show log of tracked field in open chatter as followed.
+     - Updated Fields:
+           - Stage: Analysis -> Specification
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