Added specific last_sent column to webhook, so that other kinds of
changes do not interfere with sending process.
Formatted.
Changed webhook unit test so that http client is mocked (and therefore
not dependent on current qa-1 config/status).
Added runtime config variables for number of webhook threads and retry
delay.
Updated webhook manager to use last sent date instead of last modified,
when successfully sent.
Updated webhook manager to save webhook back to DB after processing.
Added missing methods to test stub.
Mocked out webhook DAO in webhook manager test.
Corrected hashCode and equals for webhooks.
Fixed license.
Added dirties context annotation to test class, because of use of mocks.
Configured scheduler task for processing webhooks.
Changed SQL for getting webhooks that are ready to be sent, so that
newly created webhooks are handled correctly.