Plone.formwidget.recurrence

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Fixes:

- Removed unittest2 dependency.
[gforcada]
- Fix list index out of range at pagination.
[julianhandl]

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- Fix translations.
[thet]

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- Make widget work with Plone 5 recurrence pattern
[vangheem]

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- Fix error on ie9 when rendering the recurrence widget inside an overlay.
[deiferni]

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- Backport from jquery.recurrenceinput.js:
Fix a condition, where the ``startdate`` string literal was checked, if it's
an instance of ``String``, which returned False. This led to the case, where
the list of occurrences wasn't shown. String literals should be checked
with``typeof`` instead of ``instanceof``.
See: http://stackoverflow.com/a/203757/3036508
[thet]

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- Integrate latest changes from plone.formwidget.recurrence, which fixes an
issue introduced with last version, where the recurrence overlay couldn't be
opened with plone.formwidget.datetime based start fields on Dexterity
objects.
[thet]