Guillotina

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- Fixing workflow subscriber for state history
[bloodbare]

- Allow to search on basic workflow state publish
[bloodbare]

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- Adding Vocabularies API compatible to Plone REST API
[bloodbare]

- Adding Workflow contrib package with API compatible to Plone REST API
[bloodbare]

- Adding languages and contrib vocabulary
[bloodbare]

- Avoid default value check on get for each get operation
[bloodbare]

- Adding post serialize mechanism to modify JSON responses based on packages
[bloodbare]

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- Fix conflict cors response.
[bloodbare]

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- Change transaction strategy 'simple'
[masipcat]

- Fix bug on error deserialization

- Fix transaction context manager doesn't abort the txn when a exception is raised
[masipcat]

- Add id checker for move
[qiwn]

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- mailer: import 'aiosmtplib' and 'html2text' lazily
[masipcat]

- Cleanup travis logic from test fixtures [lferran]

- settings: always convert 'pool_size' to int
[masipcat]

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- Add IFileNameGenerator adapter
[qiwn]