text: Title: No way to manually serialize objects?
  Body: If I write my own route, that for example creates a new object, sometimes I would want to send that object back to the client as JSON. It's not possible to return a SQLAlchemy object - I get:
  
  ```
     raise TypeError(repr(o) + " is not JSON serializable")
  ```
  
  Is there an easy way to pass Potion an obect and have it return the serialised form to the client?
  