tests: removed NAN test for PHP 5.3.1 - 4 [Closes #98]
CodeCoverage: Collector opens file immediately to ensure that file can be opened/created early
CodeCoverage: process only real file, skips eval()
tests: PhpExecutable uses proper php.ini [Closes #109]
PhpExecutable: added hasXdebug()
Tester: added option --coverage
Tester: implemented generating HTML file for code coverage
removed coverage-report.php