Build #6

Parameters
 AEGIR_VERSION
The initial Aegir version to install
 DRUSH_VERSION
The Drush version to install initially
 UPGRADE_VERSION
The version of Aegir to upgrade to, should be a git ref, e.g. HEAD, 6.x-1.2
 TEST_TYPE
What sort of testing to perform. From Aegir 6.x-1.5 onwards, you should choose 'provision'.