Support non-concurrent execution of jobs
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                 Key: MGNLSCH-18
                 URL: http://jira.magnolia-cms.com/browse/MGNLSCH-18
             Project: Magnolia Scheduler Module
          Issue Type: New Feature
    Affects Versions: 1.4
            Reporter: Grégory Joseph
            Assignee: Philipp Bärfuss
         Attachments: MGNLSCH-18.patch

When a job takes a long time to execute but is scheduled often, it might be 
desirable to avoid concurrent executions of the job.

It seems like implementing the {{StatefulJob}} interface could be enough to 
achieve this. Here's a simple patch that allows Magnolia jobs to be configured 
as non-concurrent.

To review: implications of this change:
# should we make the default behavior ? (attached patch keeps the concurrent 
flag to true, i.e. the current default behavior)
# do we use a store for our jobs, should we, especially if we're starting to 
have long-runing jobs ?

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