add missing driver exception subclasses
fix parsing parameters in quoted text with backslash
Merge pull request #480 from deeky666/DBAL-558

[DBAL-558] Fix parsing parameters in quoted text with backslash
trim trailing whitespace in default null value in Oracle
skip unsupported tests in Oracle
fix drop and create database test in Oracle
Merge pull request #481 from deeky666/fix-oracle-test-suite

Fix Oracle test suite
Merge pull request #478 from deeky666/add-missing-driver-exception-subclasses

Add missing driver exception subclasses