Additional info in transaction log

[aasoni]

To be able to build the analytics we need for the game we need additional information to be available in the transaction log. Currently only db operations are stored.
The bare minimum extra information we would need is some way of identifying which reducer ran, and the timestamp of the transaction.
Reducer parameters would also be useful but not absolutely necessary.

Edit. Reducer parameters would actually be important currently because they contain the actor which is needed to know which player called the reducer.