zhparser NEW release！

0.2.0 (2017-05-28)
-- fix regression test
-- make pg_config configurable
-- optimize doc

0.1.5 (2017-05-24)
-- optimize memory usage for zhparser
-- support load multi dict
-- export SCWS settings to GUC
-- make context of dict_in_memory and extra_dicts to backend,others to userset
-- fix a bug of unknow type index out of range
-- detect dict file type from file extension
-- add check script to run regress
-- update scws to version 1.2.3 in install doc