see #9 - fix NULL check for DataStyle
see #9 - fix a similar issue, extract a method
see #9 - datEstyle, not datAstyle
merge from master
fix the last trace of unicode_literals in tests
import this helpers from the proper place
accept isolation level in bytes (for python2)
fix _set_guc_onoff
move code, add comment on general strategy for adapters
fixed test_quote, all python2 tests are passing
fix date and datetime parsing
compare with bytes here
fix uuid parsing
another fix in uuid
fix one hstore failure
fix hstore parsing
this does not need to accept bytes under python3
fix tokenization test - tokenizer returns bytes, not unicode