* fix class COM not found bug (affected: Windows + PHP > 5.4.5)
* detect uninstalled COM extension on install (affected: Windows + PHP > 5.4.5)
* fix undefined PHP_MAJOR_VERSION / PHP_MINOR_VERSION (affected: PHP < 5.2.7)
* fix last check not displayed on main page
* more verbose error message on import fail
* fix go ninja go install link