Add References Badge to Readme
Added regression test for #1351.
Fix #1351: Isolated TestResult contains serialized test class upon failure.
Fixed PDOException::getCode() string vs. int mismatch.
Fixed bogus expectation in ExceptionStackTest.

Catching a PHPUnit exception and rethrowing it as a non-PHPUnit exception does not make any sense.
regression for @expectedExceptionMessage feature
add message regex expectation for Util\Test
make Util\Test aware of @expectedExceptionMessageRegExp
add tests for Framework\Constraint\ExceptionMessageRegExp
add implementation for Framework\Constraint\ExceptionMessageRegExp
add failing tests for TestCase::setExpectedExceptionRegExp API
add failing testes for TestCase @expectExceptionMessageRegExp awareness
add implementation for TestCase::setExpectedExceptionRegExp api
make TestCase aware of @expectedExceptionMessageRegExp and Constraint\ExceptionMessageRegExp
tweak test coverage for Constraint\ExceptionMessageRegExp::matches and invalid regex edge case
Merge pull request #1352 from sun/result-isolation

Remove instantiated (child process) objects from TestFailure
Allow a test to identify whether it runs in isolation.

A custom setup of test fixtures may use this indicator to skip additional performance optimizations that only make sense if multiple tests are executed in the same process.
Merge pull request #1360 from sun/istestinisolation

Allow a test to identify whether it runs in isolation
Fix #1351: Add back TestFailure::failedTest() for BC.
Merge pull request #1359 from sun/result-isolation-bc

Follow-up to #1351: Restore TestFailure::failedTest()
Fixed versions numbers from 6529e40 (refs #1352).