Collective-recipe-backup

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- additional_filestorages improved: blob support and custom location.
[mamico]

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- Added pre_command and post_command options. See the documentation.
[maurits]

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- Moved code to github:
https://github.com/collective/collective.recipe.backup
[maurits]

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- Fixed silly indentation error that prevented old blob backups from
being deleted when older than ``keep_blob_days`` days.
[maurits]

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- Quit the rest of the backup or restore when a repozo call gives an
error. Main use case: when restoring to a specific date repozo will
quit with an error when no files can be found, so we should also not
try to restore blobs then.
[maurits]

- Allow restoring the blobs to the specified date as well.
[maurits]

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- Refactored script generation to make a split between initialization
code and script arguments. This restores compatibility with
zc.buildout 1.5 for system pythons. Actually we no longer create so
called 'site package safe scripts' but just normal scripts that work
for all zc.buildout versions.
[maurits]

- Added option ``keep_blob_days``, which by default specifies that
only for partial backups we keep 14 days of backups. See the
documentation.
[maurits]

- Remove old blob backups when doing a snapshot backup.
[maurits]