Get rid of local timer. pop() should rebalance 'waiting-for-ack' list and move timed out chunk into active list prior getting data from it
Added proof-of-concept python code which is capable of sending queue request directly to engine without messing with elliptics/cocaine path
ack-multi takes just entry ids now instead of full data_array

Serialize|deserialize methods moved out of the data_array.
Its better to have them as template functions.
Brought non-libev timeouts to a working state
Version bump 0.6.22

Requirement on specific cocaine-framework-native version is gone