Merge pull request ezSQL#160 from hubaishan/fixpgsql

fixBug: Creating default object from empty value in pgsql

corrections/bug fix for transaction support, when used an exception w…

…ill be throw that needs to be catch for rollback

refactor `query`, and bug fix `query_prepared` methods, now `queryRes…

…ult` correctly returns last result objects under all SQL vendors., update tests

rework bug fix, `debug` call working correctly with `prepareOn`

In reference to
ezSQL#153

fix php 7.3 deprecated warning

updates, basic schema tests

move docblock to interface

update badges, install info

corrections

Update ezSQL_postgresqlTest.php