Revert "always send back * for cors allow-origin, to sidestep caching issues"

This reverts commit 6632f1f17f1bf95a94d920917eb18df3619d1ef3.
Revert "update test for allow-origin"

This reverts commit cf841e5a8ac792986624c0e7b899eb9369238f47.
add origin to cache key, to prevent localhost poisoning cache
Merge pull request #4 from movableink/mn/add-origin-to-cache-key

add origin to cache key