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Restrict clustering key in taskList rangeID check (#292)

The CreateTasks query used to write task list tasks to persistence includes a CAS check that verifies that the rangeID has not changed.
The rangeID is a static field in the tasks table, and Cassandra only accepts the partition keys (but not the other clustering keys) in the CAS query to read and update it.
This unrestricted query however causes problems when there is a big backlog in the task list as the coordinator automatically turns it into a LIMIT 1 query.
To fix this we restrict the query with clustering keys, and rewrite non-static fields so that Cassandra accepts the query restrictions.
Issue #277

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