Adds RepeatedMsgReduction attribute

Adds RepeatedMsgReduction attribute to enable
the flexibility to turn it off when needed.
Default remains set to 'on'

See http://tickets.opscode.com/browse/COOK-3253
Merge pull request #24 from groknix/COOK-3253

Adds RepeatedMsgReduction attribute
COOK-3190 specify logs to send to remote server
COOK-3190 change to more meaningful attribute name
COOK-3190 update README with new attribute