#718 - Added validation and logging.
The Json Schema validation requires some libraries which conflicts with shindig, so not validating via schema. Putting some if clauses to handle validations for now.
Also added logging for the errors.
#718 - Added the old API based sample plugin.
This is done to provide the capability to plugin authors to refer to the old implementation if need be.
This folder will be deleted once the support for old style API based implementation is stopped.
#718 - Implementing pull request feedbacks.
#718 - Fixing the if clause.
In the older implementation if the property key was absent, the type casting to String/Boolean in the else clause would have thrown an exception.
Merge pull request #755 from mdaliejaz/add_message_based_task_plugin_api

#718 - Added validation and logging.