Add in jessie.
Merge remote-tracking branch 'upstream/master'
Manifest files for Squeeze (now oldstable).
Add security.debian.org to apt sources.list
Set grub console to text, and set system console to hvc0 on grub cmdline.
Add support for adding APT preferences
Merge remote-tracking branch 'upstream/master'

Conflicts:
	bootstrapvz/common/tasks/apt.py
Merge pull request #62 from Jimdo/add-support-for-apt-preferences

Add support for adding APT preferences
Move volume imports in fs/__init__
Move import statement
Re-raise the catched exception after rollback
Remove unused real_device_path
Unset unlinked_device_path after use
Minor adjustments in pkg code
Remove default argument (info={}) in tasklist.run
Fix check_ordering of succ. (it always succeeded)
Remove load_json fn from manifest
Set volume dev_path to None when detaching
When detaching unset single partition dev_path
add azure provider