[Composer] changed the minimum required PHP version to 5.3.3
[Composer] added phpunit/phpunit dependency to require-dev
Add support for PHPUnit 4
[PHPUnit][Preparer] changed PHPUnitPreparer to require PHPUnit/Autoload.php only if PHPUnit_Runner_Version cannot be loaded (Issue #32)
Merge pull request #33 from FrzMe/master (Issue #32)

Conflicts:
	src/Stagehand/TestRunner/Preparer/PHPUnitPreparer.php
[PHPUnit][Runner] made a few changes to JUnitXMLPrinter (Issue #32)
updated the list of contributors (Issue #32)
[test][Runner] fixed wrong namespace
[PHPUnit][Runner] changed JUnitXMLPrinter to create a well-formed XML document when no tests are found (Issue #32)
[PHPUnit] changed PHPUnitGroupFilterTestSuite to avoid raising an error "Undefined offset: 0" in PHPUnitCollector (Issue #32)
[PHPUnit] changed ResultPrinter to avoid raising an error "Undefined variable: notificationMessage" when the --notify option is specified (Issue #32)