* Added JsrJobOperator
* Added a ParametersConverter (and JSR-352 implementation) that converts parameters as specified by the JSR to JobParameters and back
* Added a method to the JobRepository to allow the direct creation of a JobInstance (since the JSR requires a new instance for each call to JobOperator#start
* Added a base context to be bootstrapped when the JobOperator is first referenced. It provides things like a JobRepository, etc.
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