Create Status Classes for Tasks

[KenSuenobu]

Create a status class for a task when running in the Scattersphere space. This way, you one can tell if the task is queued, running, or in a finished state. This queued state should be queryable at any point.

Statuses should include, but not be limited to:

QUEUED,
RUNNING,
FINISHED

The following behavioral changes to JobExecutor need to be implemented:

• Change all tasks that have been added to QUEUED state
• Before runAsync, thenRunAsync or thenRun need to be changed to RUNNING state
• After the onFinished function is called, change state to FINISHED

[KenSuenobu]

Code complete as written in the issue above.