Removed exception thrown when Marker field empty. Returns empty string instead.
Revert "BLUK-185 removing s3Handle as we have better means now"

This reverts commit 1aac4e16372e4b9abbaf1e4436e9671a14c0ecfb.
Merge branch 'master' of github.com:datacratic/soa
increased default queue size
Added basic infrastructure to implement load shedding for message loops.
Merge branch 'master' into endpoint-add_timer