Collective.documentgenerator

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- Corrected soffice script for ubuntu 16.04.
[sgeulette]
- Tests now rely on imio.helpers to import testing_logger when necessary to
have logging on Travis CI for example.
[gbastien]
- Corrected tests following changes in 3.0.1
[sgeulette]
- Added display_phone method
[sgeulette]

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- Use pod template title as default title for persisted documents.
[sdelcourt]

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- Added locking behaviors on types.
[sgeulette]
- Added MailingLoopTemplate type and mailing_loop_template field on ConfigurablePODTemplate.
[sgeulette]
- Added 'mailing-loop-persistent-document-generation' view to manage mailing loop generation
[sgeulette]
- Added helper method to manage context
[sgeulette]
- Added helper method to check if mailed data have to be replaced during rendering
[sgeulette]
- Moved filename generation to `DocumentGenerationView._get_filename` method so
it is easy to override and to call for specific usecases.
[gbastien]
- Moved persistent doc title generation moved to `DocumentGenerationView._get_title` method
so it is easy to override and to call for specific usecases.
[sgeulette]
- Do not break if temporary file can not be deleted.
[gbastien]

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- Add default value for 'pod_template' and 'output_format' attributes of the generation view.
[sdelcourt]

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- Check field_name existence following parameter: do not by default and fail if not exist
[sgeulette]

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- Corrected migration step.
[sgeulette]
- Check z3c.form.interfaces.NO_VALUE in get_value
[sgeulette]