Working toward expiry time control in Elda.
Added expires header and had the cache dispose of expired elements.
The ttoal count is now passed through a dedicated path, not pushed into the resultset.
Added expiry times, fixed problem with same.
Move conversion to RFC1123 to its own class. Add
regression test for it.
Added time-expiry tests to the caches.
These are very primitive and just show that when enough time has passed,
even if no other updates are done (which might clear the cache),
an old enough entry is dropped. For these purposes, the caches are
initialised with a Clock object which, rather than the default of
calling System.currentTimeMillis, only changes its result when a
interval has been supplied to it. (Hence we don't have to wait for
real time to elapse, or perhaps not elapse.)
Revised index page to link directly to quickstart
documentation rather than the (still supplied) root page.
Made -1 a special exiry time for the cache.
Merge in cache-control branch.