Make sure that cronfiles are also filtered with expandproperties if run under sudo

We noticed that cronfiles copied using the sudo method were not replace (which is rather logical).

This way they are first copied to a temporary directory in order to replace the variables in the files, then copied from there to the cron directory under sudo user.

@ngroot :)
Phing is running when either the files or copied to the server, or in the case of our project rsynced to a different 'release' directory. So... No, we are are not editing files in the repo if you ask me.