Redis pipeline support
Redis pipeline support - multiple _on_read events for pipeline possible
Fixes 'unknown command' error for commands: client_kill, client_list, config_get, config_resetstat, config_set, debug_object, debug_segfault, script_exists, script_flush, script_kill, script_load. Fixes 'args' name conflict for commands: eval, evalsha.
Redis pipeline support - code refactoring, pipeline reset method
Redis pipeline support - cb in _on_close method is now tuple
Redis pipeline support - code refactoring, tests and updated README
Fixed all tests to also work with python3
Added comment
Merge pull request #4 from swiecmich/master

Redis pipeline support, fixed commands and tests.