Ftw-referencewidget

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- Restrict handlebars.js to authenticated users. [tinagerber]

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- Fix use of `portal_url`, it's no longer globally available. [mathias.leimgruber]
- Add separate Plone 5 profile. [tinagerber]
- Add uninstall profile for Plone 5. [tinagerber]

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- Use unittest instead of unittest2. [jone]

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- Disable amd check for handlbar.js [mathias.leimgruber]

- Add Plone 5.1 support. [mathias.leimgruber]

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- Fix not being able to edit portal_registry entries in frontend [Nachtalb]

There was no version number set for the ``ftw.referencewidget`` package. As a result of this upgradesteps wont be shown in ``../manage-upgrades`` from `ftw.upgrade <https://github.com/4teamwork/ftw.upgrade>`_.
So the first upgradesetp ``Upgrade ftw.referencewidget:default to 20181112105705: Fix registry field frontend edit`` must be installed via the ZMI under ``../portal_setup/manage_fullImport``. This sets the version for the package and so further upgrades can be installed via ``../manage-upgrades``.

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- Fix UnicodeDecodeError. [mbaechtold]