BATCH-2006: Completed implementation of JobContext and StepContext
* Implemented the interfaces per the JSR-352 spec
* Added a ne StepContextFactoryBean used to add the StepContext (one per step) into the step scope to be available for injection by batch artifacts.
* Updated the StepParser to utilize the new StepContextFactoryBean.
Merged pull request #207 from mminella/BATCH-2006

* BATCH-2006:
  BATCH-2006: Completed implementation of JobContext and StepContext * Implemented the interfaces per the JSR-352 spec * Added a ne StepContextFactoryBean used to add the StepContext (one per step) into the step scope to be available for injection by batch artifacts. * Updated the StepParser to utilize the new StepContextFactoryBean.