Added task to clear general data cache.
Save payload to database before processing (incomplete).
Finished test payload specs.
Added resque-workers-lock to prevent concurrent test payload processing.
Link test payloads to test runs.
Show payloads in test run report.
Cache test payload bytesize in database. Added missing specs.
Link test keys to payloads to prevent accidental deletion while payload is processing.
Merge branch 'payload-processing'
Updated changelog.