https://github.com/Xosofox/PropelVersions is a copy of all the official SVN repos of propel versions, commited into branches
The intention of these repos is to use them as a git submodule in your project.
For the current most updated version, you should check out the official Propel repo on https://github.com/propelorm/Propel
THIS version includes all versions in different branches, taken from the old SVN repository (including 1.6)
Since the bundle depends on phing and propel, you might want to include
> git submodule add https://github.com/Xosofox/phing vendor/phing > git submodule add https://github.com/Xosofox/propel1.6 vendor/propel