Added upper-bound size limit to the kafka producer#375

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rogaha wants to merge 4 commits intodpkp:masterfrom

docker-hub:add_upper_bound_size_limit

Commits on May 12, 2015

removing py26, pypy, py33, py34 to get CircleCI build to pass
toli kuznets
committed

Commits on May 13, 2015

Added upper-bound size limit to the kafka producer
rogaha
committed
fixing the unit test race condition

toli kuznets
authored and
rogaha
committed
Added missing _send_upstream mock patch and converted the if statements to asserts
rogaha
committed