[OSM-dev] extracting output text from api_controller

[Xin Zheng]

Tom,
My aim is to clean up the code so I can easily and safely add new
functionality. Extracting the output string like this takes a step in that
direction.

>From the lessons I've learnt while developing software, I would highly
recommend this change.

This change would make the application more cohesive.
http://en.wikipedia.org/wiki/Cohesion_%28computer_science%29

Xin
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