- using "===" instead "==" to check if the value is 'false'
- fixed - The script will print out error and exit upon detecting any versions prior to 1.8.0: A version of Airtime older than 1.8.0 detected, please upgrade to 1.8.0 first. You will then be able to upgrade to 1.9.0 using this installer.
- install dir is renamed to install_minimal - virtualenv command is moved to install script. - need more work on install_full part