Merged acknowledgement mechanics, timeout retries, queue entry id
circulation.
Bulk pop method temporarily set aside.

Conflicts:
	src/driver/driver.cpp
	src/driver/driver.hpp
	src/queue/CMakeLists.txt
	src/queue/app.cpp
	src/queue/chunk.cpp
	src/queue/queue.cpp
	src/queue/queue.hpp
	src/queue/test.cpp
Added bulk methods pop,peek,ack and its support to queue and
testerhead-cpp apps.
Updated to cocaine-core 0.10.5-0
which dropped it own copy of json.hpp in order to directly use the one
from standalone JsonCpp library.