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* Options and events are no longer part of the core framework. An example
of an app developed on top of the **trade** framework is now on the *sample*
folder and contains the old implementations for calls and puts, as well
as the events representing stock splits, reverse stock splits and bonus shares.
* The JSON interface now must be initialized with the types of assets
that will be present in the json (like "Option", "Asset"), and also with the
tasks for the OperationContainer to run (check the tests to see how this works).