Collective.texttospeech

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- Pin version of Products.ResourceRegistries >=2.2.12 to fix upgrade step.
[rodfersou, hvelarde]

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- Ignore ``<iframe>`` tags explicitly and fix button visibility.
[rodfersou]

- Show the 'Listen' button to anonymous users only.
[hvelarde]

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- Review text extraction logic;
it is now possible to ignore parts of the text via a blacklist of CSS classes accessible in the control panel configlet.
[rodfersou, hvelarde]

- To avoid displaying the 'Listen' button with an incorrect voice,
the feature is now globally disabled by default at installation time.
[hvelarde]

- ResponsiveVoice library is now only loaded when needed.
[hvelarde]

- The 'Listen' button is now shown only after ResponsiveVoice library has been loaded.
[rodfersou]

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- Use version 1.4 of the ResponsiveVoice API.
[hvelarde]

- Package is now compatible with Plone 5.0 and Plone 5.1.
[rodfersou, hvelarde]

- Implement i18n on the widget and update translations.
[rodfersou, hvelarde]

- Simplify static files stack.
[rodfersou]

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- Add Brazilian Portuguese and Spanish translations.
[hvelarde]

- Fix an issue with package JavaScript.
[rodfersou]

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- Initial release.